Half life
•Download as PPTX, PDF•
1 like•905 views
This document provides information about absolute age dating and radioactive dating techniques. It defines key terms like absolute age dating, radioactive isotopes, parent material, half-life, and daughter material. Examples are given of radioactive elements like uranium, radon, and radium that are used in radioactive dating. Methods like radiocarbon dating are also summarized.
Report
Share
Report
Share
Recommended
Science 7.2-Half-Life
- Half-life is the time required for half of a radioactive material to decay into a non-radioactive material. Different isotopes have different half-lives.
- Carbon dating uses the half-lives of carbon-12 and carbon-14 isotopes to estimate the age of organic remains. When an organism dies, the ratio of carbon-14 to carbon-12 atoms begins changing as the carbon-14 decays.
- A decay curve is used to visually represent half-life and show the rate of decay for radioisotopes over time. It can estimate the amount of the original parent isotope remaining or the amount of daughter isotope produced.
Ch 5 Notes
This document provides an overview of elements, atoms, ions, isotopes, and the periodic table. It defines elements as pure substances that cannot be broken down further. Atoms are the smallest particles that retain an element's chemical properties and consist of protons, neutrons, and electrons. Ions are atoms or groups of atoms with a positive or negative charge formed by gaining or losing electrons. Isotopes are atoms of the same element with different numbers of neutrons. The periodic table organizes the elements and provides their properties based on their atomic structure.
Radiocarbon dating theoretical concepts & practical applications
This document provides an overview of radiocarbon dating and discusses reporting standards. It explains that radiocarbon dating uses the radioactive isotope carbon-14 to determine the age of carbon-bearing materials by comparing the amount of carbon-14 remaining to the amount expected in a fresh sample. Key points include how samples are calibrated to convert determinations into calendar dates, the importance of reporting details like laboratory codes and pretreatment methods, and an example of how radiocarbon dates from a site in Ireland can be compared to other contemporary dates. It also describes an Irish radiocarbon dating project that compiles over 6,000 radiocarbon determinations to allow comparisons across different sites and regions.
Lesson 3 Atomos, Aristotle and Alchemy (Chemistry Before Modern History)
Lesson 3 Atomos, Aristotle and Alchemy (Chemistry Before Modern History)
CONTENT:
How the idea of the atom, along with the idea of the elements evolved
CONTENT STANDARD
At the end of the lesson, you will have to describe:
1. how the concept of the atom evolved from Ancient Greek to the present; and
2. how the concept of the element evolved from Ancient Greek to the present
LEARNING COMPETENCIES
At the end of the lesson, you will have to:
1. describe the ideas of the Ancient Greeks on the atom (S11/12PS-IIIa-b-5)
2. describe the ideas of the Ancient Greeks on the elements (2 hours) (S11/12PS-IIIa-b-6)
3. describe the contributions of the alchemists to the science of chemistry (S11/12PS-IIIb-7)
Lecture
This document presents the Crestroyer Theory, which attempts to merge science and spirituality. Some key points include:
- The theory proposes that antimatter is the mind/consciousness of living entities. Physical matter exists in our universe, while antimatter exists in different universes as memory.
- In the beginning, four cosmic entities called "crestroyers" came together and used light to create the first hydrogen atom, observing different parts of it from their separate universes.
- As more crestroyers joined, the physical universe was born. The theory seeks to explain scientific mysteries like dark matter, the Big Bang, and solve puzzles around how the universe began and is structured
Crestroyer Theory
You are your own universe in close to infinite parallel universes. You are the creator and destroyer, hence the word crestroy. Consciousness is antimatter.
Ideas of the ancient greeks on atom
Democritus and Leucippus were ancient Greek scholars who were the first proponents of the atomic theory, proposing that all matter is made up of tiny, indivisible particles called atoms. They believed atoms are indestructible, impenetrable, and unchanging, moving continuously in empty space and combining to form clusters. While their ideas formed the basis of modern atomic theory, they were opposed by philosophers like Anaxagoras, Empedocles, Plato, and Aristotle, who believed matter was composed of fundamental elements like earth, water, air and fire instead of atoms.
Chem chapt 4
The document summarizes key ideas from a chemistry chapter on the structure of the atom. It discusses how ancient Greek philosophers like Democritus and Aristotle attempted to explain matter. John Dalton later revived the idea of atoms in the early 1800s based on his scientific experiments. The document also outlines the discovery of subatomic particles like protons, neutrons, and electrons, and how this led to models of the structure of the atom. It describes how atoms can be unstable and undergo radioactive decay by emitting radiation like alpha, beta, or gamma particles.
Recommended
Science 7.2-Half-Life
- Half-life is the time required for half of a radioactive material to decay into a non-radioactive material. Different isotopes have different half-lives.
- Carbon dating uses the half-lives of carbon-12 and carbon-14 isotopes to estimate the age of organic remains. When an organism dies, the ratio of carbon-14 to carbon-12 atoms begins changing as the carbon-14 decays.
- A decay curve is used to visually represent half-life and show the rate of decay for radioisotopes over time. It can estimate the amount of the original parent isotope remaining or the amount of daughter isotope produced.
Ch 5 Notes
This document provides an overview of elements, atoms, ions, isotopes, and the periodic table. It defines elements as pure substances that cannot be broken down further. Atoms are the smallest particles that retain an element's chemical properties and consist of protons, neutrons, and electrons. Ions are atoms or groups of atoms with a positive or negative charge formed by gaining or losing electrons. Isotopes are atoms of the same element with different numbers of neutrons. The periodic table organizes the elements and provides their properties based on their atomic structure.
Radiocarbon dating theoretical concepts & practical applications
This document provides an overview of radiocarbon dating and discusses reporting standards. It explains that radiocarbon dating uses the radioactive isotope carbon-14 to determine the age of carbon-bearing materials by comparing the amount of carbon-14 remaining to the amount expected in a fresh sample. Key points include how samples are calibrated to convert determinations into calendar dates, the importance of reporting details like laboratory codes and pretreatment methods, and an example of how radiocarbon dates from a site in Ireland can be compared to other contemporary dates. It also describes an Irish radiocarbon dating project that compiles over 6,000 radiocarbon determinations to allow comparisons across different sites and regions.
Lesson 3 Atomos, Aristotle and Alchemy (Chemistry Before Modern History)
Lesson 3 Atomos, Aristotle and Alchemy (Chemistry Before Modern History)
CONTENT:
How the idea of the atom, along with the idea of the elements evolved
CONTENT STANDARD
At the end of the lesson, you will have to describe:
1. how the concept of the atom evolved from Ancient Greek to the present; and
2. how the concept of the element evolved from Ancient Greek to the present
LEARNING COMPETENCIES
At the end of the lesson, you will have to:
1. describe the ideas of the Ancient Greeks on the atom (S11/12PS-IIIa-b-5)
2. describe the ideas of the Ancient Greeks on the elements (2 hours) (S11/12PS-IIIa-b-6)
3. describe the contributions of the alchemists to the science of chemistry (S11/12PS-IIIb-7)
Lecture
This document presents the Crestroyer Theory, which attempts to merge science and spirituality. Some key points include:
- The theory proposes that antimatter is the mind/consciousness of living entities. Physical matter exists in our universe, while antimatter exists in different universes as memory.
- In the beginning, four cosmic entities called "crestroyers" came together and used light to create the first hydrogen atom, observing different parts of it from their separate universes.
- As more crestroyers joined, the physical universe was born. The theory seeks to explain scientific mysteries like dark matter, the Big Bang, and solve puzzles around how the universe began and is structured
Crestroyer Theory
You are your own universe in close to infinite parallel universes. You are the creator and destroyer, hence the word crestroy. Consciousness is antimatter.
Ideas of the ancient greeks on atom
Democritus and Leucippus were ancient Greek scholars who were the first proponents of the atomic theory, proposing that all matter is made up of tiny, indivisible particles called atoms. They believed atoms are indestructible, impenetrable, and unchanging, moving continuously in empty space and combining to form clusters. While their ideas formed the basis of modern atomic theory, they were opposed by philosophers like Anaxagoras, Empedocles, Plato, and Aristotle, who believed matter was composed of fundamental elements like earth, water, air and fire instead of atoms.
Chem chapt 4
The document summarizes key ideas from a chemistry chapter on the structure of the atom. It discusses how ancient Greek philosophers like Democritus and Aristotle attempted to explain matter. John Dalton later revived the idea of atoms in the early 1800s based on his scientific experiments. The document also outlines the discovery of subatomic particles like protons, neutrons, and electrons, and how this led to models of the structure of the atom. It describes how atoms can be unstable and undergo radioactive decay by emitting radiation like alpha, beta, or gamma particles.
Atom Presentation With Narration
This document provides an overview of atoms and atomic structure through a self-guided computer activity. It discusses the atomic-molecular theory of matter and how scientists have gathered indirect evidence to develop models of atoms. It describes the subatomic particles that make up atoms, including protons, neutrons, and electrons. Atoms are electrically neutral due to having equal numbers of protons and electrons. The activity guides students to learn about atomic structure by visiting websites and completing a study guide.
Discovery of atom
The Indians first attempted to discover atoms in the 6th century BCE, referring to the smallest particle as "anor". Several scientists like Lavoisier, Kekule, and Mendeleev attempted to organize the elements into a periodic table. Dmitri Mendeleev is generally credited with inventing the periodic table of chemical elements in 1869, arranging them into a table to illustrate recurring trends in their properties. The periodic table layout has been refined over time as new elements were discovered and new theoretical models explained chemical behavior. Safety tips are provided like not experimenting carelessly in the chemistry lab and maintaining clear concepts to build a strong foundation.
Henry moseley atomic number
Henry Moseley discovered the relationship between an element's atomic number and the wavelength of its x-ray emissions. This led to a better arrangement of the periodic table and allowed scientists to predict and later synthesize new elements in the laboratory. Moseley arranged the elements according to the square root of the x-ray frequency, which more correctly predicted periodic trends. The invention of the cyclotron provided accelerated particles that could bombard heavy nuclear targets to synthesize new elements through nuclear reactions. One of the first artificially made elements was technetium, produced by bombarding molybdenum with deuterons. Many transuranic and superheavy elements have since been synthesized using similar nuclear reaction methods.
Atomic Theory, Physical Science Lesson PowerPoint
This PowerPoint is one small part of the Atoms and Periodic Table of the Elements unit from www.sciencepowerpoint.com. This unit consists of a five part 2000+ slide PowerPoint roadmap, 12 page bundled homework package, modified homework, detailed answer keys, 15 pages of unit notes for students who may require assistance, follow along worksheets, and many review games. The homework and lesson notes chronologically follow the PowerPoint slideshow. The answer keys and unit notes are great for support professionals. The activities and discussion questions in the slideshow are meaningful. The PowerPoint includes built-in instructions, visuals, and review questions. Also included are critical class notes (color coded red), project ideas, video links, and review games. This unit also includes four PowerPoint review games (110+ slides each with Answers), 38+ video links, lab handouts, activity sheets, rubrics, materials list, templates, guides, and much more. Also included is a 190 slide first day of school PowerPoint presentation.
Areas of Focus: -Atoms (Atomic Force Microscopes), Rutherford's Gold Foil Experiment, Cathode Tube, Atoms, Fundamental Particles, The Nucleus, Isotopes, AMU, Size of Atoms and Particles, Quarks, Recipe of the Universe, Atomic Theory, Atomic Symbols, #'s, Valence Electrons, Octet Rule, SPONCH Atoms, Molecules, Hydrocarbons (Structure), Alcohols (Structure), Proteins (Structure), Periodic Table of the Elements, Organization of Periodic Table, Transition Metals, Electron Negativity, Non-Metals, Metals, Metalloids, Atomic Bonds, Ionic Bonds, Covalent Bonds, Metallic Bonds, Ionization, and much more.
This unit aligns with the Next Generation Science Standards and with Common Core Standards for ELA and Literacy for Science and Technical Subjects. See preview for more information
If you have any questions please feel free to contact me. Thanks again and best wishes. Sincerely, Ryan Murphy M.Ed www.sciencepowerpoint@gmail.com
Teaching Duration = 4+ Weeks
Modeling the Atom
Slides for direct instruction on parts of an atom, electron cloud theory, and the periodic table. Sixth grade.
History of the atom
The document provides a history of discoveries related to the atom from ancient Greek philosophers to modern quantum mechanics. It describes key contributors such as Democritus proposing atoms, Dalton establishing atomic theory, Rutherford discovering the nucleus, Bohr introducing quantum mechanics, and Heisenberg establishing the uncertainty principle. The development of atomic models progressed from simple spheres to planetary structures to quantum mechanical probability distributions.
2013 module 2 the learning center
The document discusses resources available at Manor College to help students succeed academically. It describes the Learning Center, which provides free tutoring, academic skills assistance, and computer resources. It then gives tips for time management, such as scheduling adequate study hours and breaks. With the Learning Center's help, one student created a study schedule that allowed for school, work, sleep, and social activities. The Learning Center offers tutoring and other services to help students improve their grades.
One day in our life
The document is about Dos Hermanas, a city in Spain. It mentions the name of the city twice and asks if the reader likes it, suggesting it is recommending or describing the city for someone. The document is very short and does not provide much contextual information.
140218 seminar feb_revised-syk
The document summarizes recent changes to patent procedures and guidelines implemented by the Patent Law Treaty Implementation Act. It describes new procedures for filing patent applications without claims or drawings, restoring priority rights for up to 14 months, and allowing at least 2 months to respond to office actions. The After Final Consideration Pilot Program 2.0 is also summarized, which allows examiners to consider amendments after final rejection within 3 hours and conduct interviews to discuss unallowed claims.
Child Labor in Philippines
- Approximately 3 million children in the Philippines work in hazardous conditions, with 1 in 6 children working instead of attending school. Many children begin working as young as 5 years old, working 12 hours a day, 5-7 days a week.
- Common jobs for child laborers include farming, mining, factory work, domestic work, and sex work. Children work in difficult conditions with little food or breaks.
- Poverty is a major driver of child labor, as many families rely on children's wages to survive. Weak enforcement of child labor laws also allows the practice to continue, especially in important industries like agriculture and mining.
1. Gud er troværdig
Et undervisningsforløb om, hvordan Gud kalder os ind i en dybere relation med sig selv. Deltagerne skal under dette tema lytte til undervisning om, hvordan Gud kalder mennesker til at tro, og hvordan hans rige kan blive virkelig, når vi tror.
Science10 h permanentice
Permanent ice biomes are characterized by very cold temperatures, strong winds, little soil and fresh water, and are mainly composed of ice. They exist far north and south of the equator. Lichens and mosses are the main plant life, while the Arctic has more plant diversity than Antarctica. Common animal species in the Arctic include polar bears, walruses, seals, and Arctic foxes, while the Antarctic is home primarily to penguins. These species have adapted thick coats and layers of fat to survive the harsh climate. Climate is marked by low annual precipitation, average summer temperatures just above freezing, and winter temperatures well below freezing. Human pollution threatens these ecosystems by causing global warming and contaminating water sources.
Spain and its monuments
Spain has many historic monuments from its past, including Seville's Cathedral and Giralda tower, bullrings in Seville and Madrid, bridges in Seville spanning the Guadalquivir River, and architectural sites throughout Spain such as the Alhambra in Granada, the aqueduct in Segovia, terrace houses in Cuenca, El Escorial monastery in Madrid, the mosque in Cordoba, and the City of Arts and Sciences in Valencia. The document provides a list of notable historic and architectural monuments found across Spain.
โครงการตรวจสอบครุภัณฑ์ ปวช.2/2
This document summarizes the monitoring of three school canteens. It describes checking the condition of equipment, cleanliness, and ventilation. Tables and chairs were rearranged for comfort. Damaged equipment was noted for repair. Charts show the number of tables and chairs found in each canteen, and any equipment missing barcodes. Issues found include missing barcodes, garbage, and lack of ventilation. Solutions include informing staff, checking teacher data, and taking care of problems.
La competencia de comprension lectora en estudiantes de nivel medio superior
La competencia de comprension lectora en estudiantes de nivel medio superiorAdelina (Ade) Salguero Flores
Este documento describe una investigación sobre el desarrollo de la competencia de comprensión lectora en estudiantes de nivel medio superior a través de la lectura de textos expositivos y el uso del programa CmapTools. La investigación utilizó métodos cualitativos como observación y entrevistas con 29 estudiantes. Los resultados mostraron que los estudiantes desarrollaron habilidades como el análisis, selección y representación de información a través de mapas conceptuales usando CmapTools. Se concluyó que el programa ayudó a los estudiantesTurkey meeting
The document discusses the benefits of exercise for mental health. Regular physical activity can help reduce anxiety and depression and improve mood and cognitive function. Exercise causes chemical changes in the brain that may help protect against mental illness and improve symptoms.
Christmas in spain
Christmas is a popular holiday celebrated in Andalusia, Spain from November through January 6th, regardless of religious beliefs. During this season, streets and squares are decorated with lights and nativity scenes to mark the coming of Christmas. People also set up nativity scenes and Christmas trees in their homes, decorating the trees with lights and ornaments as they celebrate the gifts the Three Wise Men are said to bring children on January 6th, ending the Christmas season.
It’s about time revised
This document discusses key concepts for determining the relative age of geological formations and fossils. It defines the difference between a timeline and timescale, and between absolute and relative dating. It also explains several principles that geologists use to relatively date formations and events in Earth's history, including the law of superposition, original horizontality, cross-cutting relationships, inclusions, intrusions, and unconformities.
Muazzam_mirza[1]
Muazzam Hidayat Ali Mirza is seeking a position in project and facility management with over 20 years of experience in various roles including chief engineer, senior supervisor, and HVAC supervisor and technician. He has a strong background in project planning, cost control, quality assurance, and maintenance and operations across various industries. His skills include administration, contract management, financial reporting, and ensuring tasks are completed on time and to a high standard.
More Related Content
What's hot
Atom Presentation With Narration
This document provides an overview of atoms and atomic structure through a self-guided computer activity. It discusses the atomic-molecular theory of matter and how scientists have gathered indirect evidence to develop models of atoms. It describes the subatomic particles that make up atoms, including protons, neutrons, and electrons. Atoms are electrically neutral due to having equal numbers of protons and electrons. The activity guides students to learn about atomic structure by visiting websites and completing a study guide.
Discovery of atom
The Indians first attempted to discover atoms in the 6th century BCE, referring to the smallest particle as "anor". Several scientists like Lavoisier, Kekule, and Mendeleev attempted to organize the elements into a periodic table. Dmitri Mendeleev is generally credited with inventing the periodic table of chemical elements in 1869, arranging them into a table to illustrate recurring trends in their properties. The periodic table layout has been refined over time as new elements were discovered and new theoretical models explained chemical behavior. Safety tips are provided like not experimenting carelessly in the chemistry lab and maintaining clear concepts to build a strong foundation.
Henry moseley atomic number
Henry Moseley discovered the relationship between an element's atomic number and the wavelength of its x-ray emissions. This led to a better arrangement of the periodic table and allowed scientists to predict and later synthesize new elements in the laboratory. Moseley arranged the elements according to the square root of the x-ray frequency, which more correctly predicted periodic trends. The invention of the cyclotron provided accelerated particles that could bombard heavy nuclear targets to synthesize new elements through nuclear reactions. One of the first artificially made elements was technetium, produced by bombarding molybdenum with deuterons. Many transuranic and superheavy elements have since been synthesized using similar nuclear reaction methods.
Atomic Theory, Physical Science Lesson PowerPoint
This PowerPoint is one small part of the Atoms and Periodic Table of the Elements unit from www.sciencepowerpoint.com. This unit consists of a five part 2000+ slide PowerPoint roadmap, 12 page bundled homework package, modified homework, detailed answer keys, 15 pages of unit notes for students who may require assistance, follow along worksheets, and many review games. The homework and lesson notes chronologically follow the PowerPoint slideshow. The answer keys and unit notes are great for support professionals. The activities and discussion questions in the slideshow are meaningful. The PowerPoint includes built-in instructions, visuals, and review questions. Also included are critical class notes (color coded red), project ideas, video links, and review games. This unit also includes four PowerPoint review games (110+ slides each with Answers), 38+ video links, lab handouts, activity sheets, rubrics, materials list, templates, guides, and much more. Also included is a 190 slide first day of school PowerPoint presentation.
Areas of Focus: -Atoms (Atomic Force Microscopes), Rutherford's Gold Foil Experiment, Cathode Tube, Atoms, Fundamental Particles, The Nucleus, Isotopes, AMU, Size of Atoms and Particles, Quarks, Recipe of the Universe, Atomic Theory, Atomic Symbols, #'s, Valence Electrons, Octet Rule, SPONCH Atoms, Molecules, Hydrocarbons (Structure), Alcohols (Structure), Proteins (Structure), Periodic Table of the Elements, Organization of Periodic Table, Transition Metals, Electron Negativity, Non-Metals, Metals, Metalloids, Atomic Bonds, Ionic Bonds, Covalent Bonds, Metallic Bonds, Ionization, and much more.
This unit aligns with the Next Generation Science Standards and with Common Core Standards for ELA and Literacy for Science and Technical Subjects. See preview for more information
If you have any questions please feel free to contact me. Thanks again and best wishes. Sincerely, Ryan Murphy M.Ed www.sciencepowerpoint@gmail.com
Teaching Duration = 4+ Weeks
Modeling the Atom
Slides for direct instruction on parts of an atom, electron cloud theory, and the periodic table. Sixth grade.
History of the atom
The document provides a history of discoveries related to the atom from ancient Greek philosophers to modern quantum mechanics. It describes key contributors such as Democritus proposing atoms, Dalton establishing atomic theory, Rutherford discovering the nucleus, Bohr introducing quantum mechanics, and Heisenberg establishing the uncertainty principle. The development of atomic models progressed from simple spheres to planetary structures to quantum mechanical probability distributions.
What's hot (6)
Viewers also liked
2013 module 2 the learning center
The document discusses resources available at Manor College to help students succeed academically. It describes the Learning Center, which provides free tutoring, academic skills assistance, and computer resources. It then gives tips for time management, such as scheduling adequate study hours and breaks. With the Learning Center's help, one student created a study schedule that allowed for school, work, sleep, and social activities. The Learning Center offers tutoring and other services to help students improve their grades.
One day in our life
The document is about Dos Hermanas, a city in Spain. It mentions the name of the city twice and asks if the reader likes it, suggesting it is recommending or describing the city for someone. The document is very short and does not provide much contextual information.
140218 seminar feb_revised-syk
The document summarizes recent changes to patent procedures and guidelines implemented by the Patent Law Treaty Implementation Act. It describes new procedures for filing patent applications without claims or drawings, restoring priority rights for up to 14 months, and allowing at least 2 months to respond to office actions. The After Final Consideration Pilot Program 2.0 is also summarized, which allows examiners to consider amendments after final rejection within 3 hours and conduct interviews to discuss unallowed claims.
Child Labor in Philippines
- Approximately 3 million children in the Philippines work in hazardous conditions, with 1 in 6 children working instead of attending school. Many children begin working as young as 5 years old, working 12 hours a day, 5-7 days a week.
- Common jobs for child laborers include farming, mining, factory work, domestic work, and sex work. Children work in difficult conditions with little food or breaks.
- Poverty is a major driver of child labor, as many families rely on children's wages to survive. Weak enforcement of child labor laws also allows the practice to continue, especially in important industries like agriculture and mining.
1. Gud er troværdig
Et undervisningsforløb om, hvordan Gud kalder os ind i en dybere relation med sig selv. Deltagerne skal under dette tema lytte til undervisning om, hvordan Gud kalder mennesker til at tro, og hvordan hans rige kan blive virkelig, når vi tror.
Science10 h permanentice
Permanent ice biomes are characterized by very cold temperatures, strong winds, little soil and fresh water, and are mainly composed of ice. They exist far north and south of the equator. Lichens and mosses are the main plant life, while the Arctic has more plant diversity than Antarctica. Common animal species in the Arctic include polar bears, walruses, seals, and Arctic foxes, while the Antarctic is home primarily to penguins. These species have adapted thick coats and layers of fat to survive the harsh climate. Climate is marked by low annual precipitation, average summer temperatures just above freezing, and winter temperatures well below freezing. Human pollution threatens these ecosystems by causing global warming and contaminating water sources.
Spain and its monuments
Spain has many historic monuments from its past, including Seville's Cathedral and Giralda tower, bullrings in Seville and Madrid, bridges in Seville spanning the Guadalquivir River, and architectural sites throughout Spain such as the Alhambra in Granada, the aqueduct in Segovia, terrace houses in Cuenca, El Escorial monastery in Madrid, the mosque in Cordoba, and the City of Arts and Sciences in Valencia. The document provides a list of notable historic and architectural monuments found across Spain.
โครงการตรวจสอบครุภัณฑ์ ปวช.2/2
This document summarizes the monitoring of three school canteens. It describes checking the condition of equipment, cleanliness, and ventilation. Tables and chairs were rearranged for comfort. Damaged equipment was noted for repair. Charts show the number of tables and chairs found in each canteen, and any equipment missing barcodes. Issues found include missing barcodes, garbage, and lack of ventilation. Solutions include informing staff, checking teacher data, and taking care of problems.
La competencia de comprension lectora en estudiantes de nivel medio superior
La competencia de comprension lectora en estudiantes de nivel medio superiorAdelina (Ade) Salguero Flores
Este documento describe una investigación sobre el desarrollo de la competencia de comprensión lectora en estudiantes de nivel medio superior a través de la lectura de textos expositivos y el uso del programa CmapTools. La investigación utilizó métodos cualitativos como observación y entrevistas con 29 estudiantes. Los resultados mostraron que los estudiantes desarrollaron habilidades como el análisis, selección y representación de información a través de mapas conceptuales usando CmapTools. Se concluyó que el programa ayudó a los estudiantesTurkey meeting
The document discusses the benefits of exercise for mental health. Regular physical activity can help reduce anxiety and depression and improve mood and cognitive function. Exercise causes chemical changes in the brain that may help protect against mental illness and improve symptoms.
Christmas in spain
Christmas is a popular holiday celebrated in Andalusia, Spain from November through January 6th, regardless of religious beliefs. During this season, streets and squares are decorated with lights and nativity scenes to mark the coming of Christmas. People also set up nativity scenes and Christmas trees in their homes, decorating the trees with lights and ornaments as they celebrate the gifts the Three Wise Men are said to bring children on January 6th, ending the Christmas season.
It’s about time revised
This document discusses key concepts for determining the relative age of geological formations and fossils. It defines the difference between a timeline and timescale, and between absolute and relative dating. It also explains several principles that geologists use to relatively date formations and events in Earth's history, including the law of superposition, original horizontality, cross-cutting relationships, inclusions, intrusions, and unconformities.
Muazzam_mirza[1]
Muazzam Hidayat Ali Mirza is seeking a position in project and facility management with over 20 years of experience in various roles including chief engineer, senior supervisor, and HVAC supervisor and technician. He has a strong background in project planning, cost control, quality assurance, and maintenance and operations across various industries. His skills include administration, contract management, financial reporting, and ensuring tasks are completed on time and to a high standard.
Bulgarian Recipes
This document summarizes several traditional Bulgarian dishes. It describes bob tchorba, a bean soup that is a ritual dish for Christmas Eve. It also mentions moussaka, gyuvech (dishes cooked in earthenware pots), sarmi (stuffed vine or cabbage leaves), stuffed peppers, kapamah (a dish from Razlog made in an earthenware pot), patatnik (potatoes and cheese dish that can include meat), kavarmah (a stew that is a signature Bulgarian dish), caramel cream with burnt sugar, and tikvenik (a pumpkin pasty). Many dishes have been passed down through generations and show the influence of other Balkan
Pinky dinky doo
Pinky y el nudo del espagueti trata sobre Pinky y un nudo de espagueti. La pelota también se menciona brevemente.
Total ranks
This document provides instructions for ranking and scoring multiple shampoo samples based on various tests to determine the best overall shampoo. It describes:
1) Using a 1-6 ranking scale to score each shampoo on different tests like pH, foam height, foam retention, viscosity, and dirt dispersion, with 6 being the highest score.
2) In the case of ties, the tied shampoos all receive the same score and the next shampoo skips points.
3) Calculating a total rank score for each shampoo by adding up the scores from each test, with the highest total being the best overall.
4) Comparing the best overall shampoo to its
Viewers also liked (20)
La competencia de comprension lectora en estudiantes de nivel medio superior
La competencia de comprension lectora en estudiantes de nivel medio superior
Разработка средств управления и мониторинга распределенной мультиагентной сис...
Разработка средств управления и мониторинга распределенной мультиагентной сис...
Similar to Half life
Chapter 16.3: Absolute Age Dating
Grade 8 Integrated Science Chapter 16 Lesson 3 on absolute age dating of fossils. This lesson follows the last lesson about relative age dating. This chapter describes radiometric age dating with explanations of radioactive decay and half-life. There is also a short explanation of igneous, metamorphic, and sedimentary age dating. The goal is that students understand radioactive decay, half-life, and how this can be used to determine the age of carbon fossils and different types of rocks.
Ppt 12.3 earth
Radiometric dating uses the radioactive decay of isotopes to determine the age of rocks and minerals. Radioactive isotopes have a predictable half-life, the time it takes for half of the atoms in a sample to decay. Methods like radiocarbon dating compare the ratio of radioactive to stable isotopes in samples to calculate their age since formation.
Dating fossils and rocks
This document discusses various methods for dating fossils and rocks, including carbon-14 dating and radioisotope dating. It explains how these methods work, such as by measuring the ratio of carbon-12 to carbon-14 in a sample. However, it notes that all of these dating methods rely on assumptions, like the starting conditions and decay rates having always remained constant, that are difficult to prove and have been shown to be inaccurate at times by experiments. Therefore, the ages provided by these dating methods are not completely reliable and should be interpreted with caution.
Earth science 12.3
This document discusses radiometric dating and how it is used to determine the absolute ages of rocks and minerals. It explains key concepts such as radioactivity, half-life, and how comparing ratios of radioactive isotopes like carbon-14 and carbon-12 can be used to calculate radiocarbon dates for samples. Radiometric dating relies on the fact that radioactive isotopes decay at a constant rate and comparing the amounts of parent and daughter isotopes allows the age of a sample to be estimated.
Is radioactive dating accurate
This document discusses problems with radioactive dating methods. It summarizes that radioactive dating relies on assumptions about initial isotope levels that may not be accurate. Measurements of carbon-14 levels in tree rings over 3000 years show levels can vary by 70%, undermining the assumption of constant levels. Dates older than 3000 years derived from carbon-14 may not be reliable. Other dating methods rely on similar assumptions and have produced dates in conflict with observations or other dating methods. While radioactive dating can be useful for objects under 3000 years, interpretations require consideration of its limitations.
Lesson 3 Atoms and Isotopes | The Harnessed Atom (2016)
- Atoms are the smallest units of matter and are made up of protons, neutrons and electrons. Protons and neutrons are located in the nucleus, while electrons orbit around the nucleus.
- Isotopes are atoms of the same element that have different numbers of neutrons. The number of protons defines the element.
- The strong nuclear force holds atom nuclei together, and it is the strongest known force in nature. Some isotopes are unstable and can release energy through radioactive decay.
Kuliah geokimia 6a
Radiometric dating uses the natural radioactive decay of isotopes to determine the age of rocks and other materials. Only two measurements are needed: the ratio of parent and daughter isotopes, and the decay constant. Examples given include carbon-14 dating of organic materials and potassium-argon dating of igneous rocks. Difficulties can arise from open systems and metamorphism altering isotope ratios, so only fresh samples are suitable for dating. Radiometric dating has established that geological time spans billions of years.
Geochem all Labs. Lab for geochemistry a branch
This document provides an outline for a Geochemistry 319 course, including topics such as the periodic table, radiometric dating of rocks, interpreting chemical analyses using Niggli values and CIPW norm calculations, classifying igneous and metamorphic rocks, and using ACF diagrams. Key concepts covered are radiometric dating techniques, calculating mineral formulas from chemical analyses, and classifying rocks based on their geochemical properties. A midterm exam is scheduled between topics on CIPW norm calculations and interpreting mafic and ultramafic rocks.
Carbon Dating 2.pptx
Carbon dating determines the age of organic material by measuring the amount of carbon-14 remaining in the material. Carbon-14 is continually produced in the atmosphere and absorbed by plants and animals during life. After death, the amount of carbon-14 decreases steadily as it decays, allowing the age of once-living materials to be estimated by measuring the amount remaining. The half-life of carbon-14 is about 5730 years, so its levels are measured to calculate elapsed time since death. Carbon dating is widely used in archaeology and geology to estimate the age of ancient living things.
7.2 Half-Life
The document discusses various methods of radioactive dating. It defines key terms like half-life, decay curve, and radiocarbon dating. It explains that radiocarbon dating works by measuring the ratio of carbon-14 to carbon-12 in once-living materials, and that this ratio decreases over time as the carbon-14 decays. Common parent-daughter isotope pairs used for dating are described, such as potassium-40 decaying to argon-40, which has a half-life of 1.3 billion years.
Radioactive Elements Research Paper
This document discusses the radioactive isotope fluorine-18. It begins by explaining that fluorine-18 is a positron-emitting radioisotope used in positron emission tomography (PET) scans to produce diagnostic images. It has a half-life of only 110 minutes, requiring scans to be performed near sites that produce the isotope. Fluorine-18 is attached to fluorodeoxyglucose (FDG), a glucose analog, to produce FDG which is taken up by glucose-metabolizing tissues like the brain and tumors. After being injected into patients, FDG accumulates in areas of high glucose uptake and undergoes radioactive decay that is detected by a PET scanner to produce 3D images. While very
Dating Fossils And Rocks
Mike Riddle has put together a brilliant slideshow examining the truths and misnomers of dating methods currently used by scientists eager to propogate their evolutionary agenda. I hope you enjoy Mr. Riddle's slidshow as much as I have.
Radimatric dating112121123121242342134125125.ppt
This document discusses radiometric dating techniques used to determine the absolute ages of rocks, minerals, and fossils. It explains that radioactive elements decay at consistent rates, allowing scientists to measure the proportions of parent and daughter isotopes to calculate age. Examples are given of potassium-argon dating, uranium-lead dating, and radiocarbon dating, along with their applicable time ranges. The production of carbon-14 in the atmosphere and its incorporation into living things is also summarized.
Different Methods to study evolution.pptx
The document discusses several methods used to study evolution, including observational field studies, fossil record analysis, comparative anatomy and morphology, and molecular genetics techniques. Observation of organisms in nature allows scientists to see evolution directly, while the fossil record provides physical evidence of past life and transitions over geological time. Comparisons of anatomical structures and molecular data across species help elucidate evolutionary relationships and reconstruct evolutionary history. Together, these diverse approaches provide insights into evolutionary patterns, mechanisms, and histories.
5. Place the layers from Figure 3 (below) in order from the youngest .pdf
5. Place the layers from Figure 3 (below) in order from the youngest to the oldest. Oldest
Rart 2. Absolete Dating Absolute, or radiometric, dating is the only method for putting an actual
numerical age ("absolute age") to rocks. Absolute dating uses radioactive isotopes that are
unstable and decay by emitting nuclear particles (either neutrons or protons). (Remember: The
term "isovopes" nefers to atoms that have the same namber of protons, ie, they are the same
chemical dement but diokerent number of neidrons. When protons are emitted during decay, the
atom is transfomed from one clement to another. The initial radioactive isotopes in a rock or
fossil are called parent isotopes. During the decay process, the parent isotopes are transformed
into new isotopes of different elements called daughter isotopes. The change does not always
occur at a linear rate. The rate of change in this radioactive decay occurs at an exponential rate.
Decay is expressed in terms of a length of time called a half-life. A half-life is amount of time
necessary for half of the original parent atoms to decay to daughter product/atoms. Elements
such as carbon, uranium, potassium, rubidium, and thorium each have their own radioactive
isotopes and can be used to determine the age of igneous rocks millions to billions of years old.
Carbon has a radioactive isotope that can be used to date organic matter (and some fossils) less
than 65,000 years old. For this reason, geologists usually study radioactive isotopes other than
carbon. 6. An unstable isotope Q has a half-life of 1,000 years and decays to a stable isotope Z.
A mineral forms from magma and becomes part of an igneous rock. Initially, it contains no Z
atoms. A geologist analyzes the mineral and finds a ratio of Q atoms to Z atoms of 1:3. a)
Assuming no leakage to the environment, how old is the mineral? b) If the ratio of Q to Z were
1:15, how old would the mineral be?.
Earth Science 3.3 : Absolute Dating: A Measure of Time
Radiometric dating determines the age of objects by measuring the decay of radioactive isotopes into stable daughter isotopes. There are four main types of radiometric dating: 1) potassium-argon dating works on rocks over 100,000 years old, 2) uranium-lead dating dates rocks over 10 million years using uranium-238 decay, 3) rubidium-strontium dating also dates rocks over 10 million years, and 4) carbon-14 dating is used on objects under 50,000 years old by measuring carbon-14 decay. The rate of radioactive decay remains constant, allowing scientists to determine a sample's age based on the ratio of parent and daughter isotopes.
CHAP 3 ATOMS AND MOLECULES GR 9 2020-21
For more such informative content, go to https://scifitechify.blogspot.com/. This video will introduce you to the world of ATOMS & MOLECULES. HOPE YOU ENJOY IT. NEXT POST ON: WHY DO WE WEIGH LESS ON THE MOON ?
Elements and Atoms
The periodic table can be used to determine the structure of an atom. The atomic number indicates the number of protons in the nucleus, while the atomic mass provides the total number of protons and neutrons. By subtracting the atomic number from the atomic mass, we can calculate the number of neutrons. The periodic table also shows the arrangement of elements by increasing atomic number and energy levels which indicate where electrons are located around the nucleus.
Half-life and Nuclear Reactions
This document discusses several topics relating to nuclear reactions and radioactivity:
- Half-life is defined as the time it takes for the radioactivity of a specific isotope to fall to half its original value. It can be demonstrated using a decay curve. Radiocarbon dating uses carbon-14 decay to determine the age of organic materials.
- Nuclear fission and fusion are two types of nuclear reactions. Fission involves splitting a heavy nucleus into lighter nuclei, while fusion combines low mass nuclei into a heavier nucleus.
- A nuclear reaction occurs when an atom's nucleus changes by gaining or releasing particles or energy. Induced reactions are initiated artificially in a laboratory. Chain reactions are self-sustaining nuclear
Half-life and Nuclear Reaction
This document discusses several topics relating to nuclear reactions and radioactivity:
- It defines half-life as the time it takes for the radioactivity of a specific isotope to fall to half its original value. Half-life can be demonstrated using a decay curve.
- It explains that radiocarbon dating determines the age of an element by measuring the amount of carbon-14 remaining in the element.
- It describes nuclear fission as the splitting of a large nucleus into two smaller nuclei, releasing energy. Nuclear fusion is when two low mass nuclei join together to form a larger nucleus.
- It provides examples of nuclear reactions, such as those induced by bombarding a nucleus with subatomic particles, and defines
Similar to Half life (20)
Lesson 3 Atoms and Isotopes | The Harnessed Atom (2016)
Lesson 3 Atoms and Isotopes | The Harnessed Atom (2016)
5. Place the layers from Figure 3 (below) in order from the youngest .pdf
5. Place the layers from Figure 3 (below) in order from the youngest .pdf
Earth Science 3.3 : Absolute Dating: A Measure of Time
Earth Science 3.3 : Absolute Dating: A Measure of Time
Half life
- 1. At the bell Filling out your planner and sitting quietly Split a blank piece of paper with a partner Or come grab scrap paper off my desk
- 2. Vocabulary Review Unconformity- Law of Superposition- Absolute age dating-
- 4. Absolute Age Dating the process of establishing the age of an object by determining the number of years it has existed Scientists have figured out an exact or precise age We are absolutely sure of the age
- 5. Chemistry Review ● What parts make up an atom?
- 6. What does it mean to be radioactive? Radioactivity- the spontaneous decay of certain unstable atomic nuclei But what does that mean?
- 7. Radioactive Isotope ● ● Means we have an element with a changed mass It has more neutrons!
- 8. Radiocarbon dating When an organism dies, the amount of carbon-14 it contains gradually decreases as it decays. By comparing the ratio of carbon-14 to carbon-12 in a sample, radiocarbon dates can be determined.
- 9. All elements have radioactive isotopes Some just don't have any stable forms like ● Uranium ● Radon ● Radium ● Plutonium
- 10. Parent Material ● Is the radioactive isotope you start with Like Uranium
- 11. Half Life A half-life is the amount of time necessary for one-half of the nuclei in a sample (parent) to decay to a stable isotope (daughter).
- 12. Daughter Material ● Is whatever element the radioactive isotope decays to
- 13. After one half-life Only half the parent material remains So after 2 half lives…..how much remains?
- 14. Which is less stable The parent isotope or the daughter product?
- 15. Cobalt-60 The half-life of cobalt-60 is 5 years. If you have 10 grams of Co-60, how much do you have after 15 years?