1) Atoms have discrete energy levels that electrons can occupy. Electrons prefer the lowest energy level.
2) Excitation energy is the energy needed for an electron to jump to a higher energy level when absorbing a photon. Ionization energy is the energy needed for an electron to escape the atom.
3) Hydrogen emission spectra occur when electrons fall from excited states and emit photons of characteristic wavelengths, such as the Balmer series in visible light. Absorption spectra show dark lines where light is absorbed by electrons jumping to excited states.
An electromagnet is a magnet that runs on electricity. Unlike a permanent magnet, the strength of an electromagnet can easily be changed by changing the amount of electric current that flows through it. ... An electromagnet works because an electric current produces a magnetic field. Electromagnetism is produced when an electrical current flows through a simple conductor such as a length of wire or cable, and as current passes along the whole of the conductor then a magnetic field is created along the whole of the conductor.
An electromagnet is a magnet that runs on electricity. Unlike a permanent magnet, the strength of an electromagnet can easily be changed by changing the amount of electric current that flows through it. ... An electromagnet works because an electric current produces a magnetic field. Electromagnetism is produced when an electrical current flows through a simple conductor such as a length of wire or cable, and as current passes along the whole of the conductor then a magnetic field is created along the whole of the conductor.
Time Independent Perturbation Theory, 1st order correction, 2nd order correctionJames Salveo Olarve
The presentation is about how to solve the new energy levels and wave functions when the simple Hamiltonian is added by another term due to external effect (can be due to external field) .
The intended reader of this presentation were physics students. The author already assumed that the reader knows dirac braket notation.
Ionization is the process by which an atom or a molecule acquires a negative or positive charge by gaining or losing electrons to form ions, often in conjunction with other chemical changes.[1] Ionization can result from the loss of an electron after collisions with subatomic particles, collisions with other atoms, molecules and ions, or through the interaction with light. Heterolytic bond cleavage and heterolytic substitution reactions can result in the formation of ion pairs. Ionization can occur through radioactive decay by the internal conversion process, in which an excited nucleus transfers its energy to one of the inner-shell electrons causing it to be ejected.
i am student of M.Sc (Physics) in university of sindh. it is my first book on high energy physics and i will also upload the new version of this book soon. so please read this book and give me feed back on my email address.
How To Determine The Colour Of Transition Metal ComplexesDenison Dwarkah
Many times students ask the question as to how do we figure out what colour a complex will be. This is a basic starting point and applies to the CAPE Chemistry Syllabus, Module 3 Section 5.
Time Independent Perturbation Theory, 1st order correction, 2nd order correctionJames Salveo Olarve
The presentation is about how to solve the new energy levels and wave functions when the simple Hamiltonian is added by another term due to external effect (can be due to external field) .
The intended reader of this presentation were physics students. The author already assumed that the reader knows dirac braket notation.
Ionization is the process by which an atom or a molecule acquires a negative or positive charge by gaining or losing electrons to form ions, often in conjunction with other chemical changes.[1] Ionization can result from the loss of an electron after collisions with subatomic particles, collisions with other atoms, molecules and ions, or through the interaction with light. Heterolytic bond cleavage and heterolytic substitution reactions can result in the formation of ion pairs. Ionization can occur through radioactive decay by the internal conversion process, in which an excited nucleus transfers its energy to one of the inner-shell electrons causing it to be ejected.
i am student of M.Sc (Physics) in university of sindh. it is my first book on high energy physics and i will also upload the new version of this book soon. so please read this book and give me feed back on my email address.
How To Determine The Colour Of Transition Metal ComplexesDenison Dwarkah
Many times students ask the question as to how do we figure out what colour a complex will be. This is a basic starting point and applies to the CAPE Chemistry Syllabus, Module 3 Section 5.
Most of the times this study confused me...so, i just put some important points in one place to easily keep them in mind..hope it will help other students as well..and inform me, if a reader find anything new to improve it further.
This presentation gives an introduction to mechanical vibration or Theory of Vibration for BE courses. Presentation is prepared as per the syllabus of VTU.For any suggestions and criticisms please mail to: hareeshang@gmail.com or visit:ww.hareeshang.wikifoundry.com.
Thanks for watching this presentation.
Hareesha N G
Chapter 1: THE ATOM MODEL :
Text book...An introduction to Atomic, Molecular Physics and LASER by Education Publishers, Aurangabad is useful for Physics students.
Basics of Band Structure and semiconductors.pdfDr Biplab Bag
Basics of Band Structure and semiconductors: How the energy bands and energy gaps are formed, Classification of metals/insulators/semiconductors, Fermi level, conduction & valance bands have been discussed
Instructions for Submissions thorugh G- Classroom.pptxJheel Barad
This presentation provides a briefing on how to upload submissions and documents in Google Classroom. It was prepared as part of an orientation for new Sainik School in-service teacher trainees. As a training officer, my goal is to ensure that you are comfortable and proficient with this essential tool for managing assignments and fostering student engagement.
How to Make a Field invisible in Odoo 17Celine George
It is possible to hide or invisible some fields in odoo. Commonly using “invisible” attribute in the field definition to invisible the fields. This slide will show how to make a field invisible in odoo 17.
Ethnobotany and Ethnopharmacology:
Ethnobotany in herbal drug evaluation,
Impact of Ethnobotany in traditional medicine,
New development in herbals,
Bio-prospecting tools for drug discovery,
Role of Ethnopharmacology in drug evaluation,
Reverse Pharmacology.
Read| The latest issue of The Challenger is here! We are thrilled to announce that our school paper has qualified for the NATIONAL SCHOOLS PRESS CONFERENCE (NSPC) 2024. Thank you for your unwavering support and trust. Dive into the stories that made us stand out!
Students, digital devices and success - Andreas Schleicher - 27 May 2024..pptxEduSkills OECD
Andreas Schleicher presents at the OECD webinar ‘Digital devices in schools: detrimental distraction or secret to success?’ on 27 May 2024. The presentation was based on findings from PISA 2022 results and the webinar helped launch the PISA in Focus ‘Managing screen time: How to protect and equip students against distraction’ https://www.oecd-ilibrary.org/education/managing-screen-time_7c225af4-en and the OECD Education Policy Perspective ‘Students, digital devices and success’ can be found here - https://oe.cd/il/5yV
The Indian economy is classified into different sectors to simplify the analysis and understanding of economic activities. For Class 10, it's essential to grasp the sectors of the Indian economy, understand their characteristics, and recognize their importance. This guide will provide detailed notes on the Sectors of the Indian Economy Class 10, using specific long-tail keywords to enhance comprehension.
For more information, visit-www.vavaclasses.com
How to Create Map Views in the Odoo 17 ERPCeline George
The map views are useful for providing a geographical representation of data. They allow users to visualize and analyze the data in a more intuitive manner.
The Roman Empire A Historical Colossus.pdfkaushalkr1407
The Roman Empire, a vast and enduring power, stands as one of history's most remarkable civilizations, leaving an indelible imprint on the world. It emerged from the Roman Republic, transitioning into an imperial powerhouse under the leadership of Augustus Caesar in 27 BCE. This transformation marked the beginning of an era defined by unprecedented territorial expansion, architectural marvels, and profound cultural influence.
The empire's roots lie in the city of Rome, founded, according to legend, by Romulus in 753 BCE. Over centuries, Rome evolved from a small settlement to a formidable republic, characterized by a complex political system with elected officials and checks on power. However, internal strife, class conflicts, and military ambitions paved the way for the end of the Republic. Julius Caesar’s dictatorship and subsequent assassination in 44 BCE created a power vacuum, leading to a civil war. Octavian, later Augustus, emerged victorious, heralding the Roman Empire’s birth.
Under Augustus, the empire experienced the Pax Romana, a 200-year period of relative peace and stability. Augustus reformed the military, established efficient administrative systems, and initiated grand construction projects. The empire's borders expanded, encompassing territories from Britain to Egypt and from Spain to the Euphrates. Roman legions, renowned for their discipline and engineering prowess, secured and maintained these vast territories, building roads, fortifications, and cities that facilitated control and integration.
The Roman Empire’s society was hierarchical, with a rigid class system. At the top were the patricians, wealthy elites who held significant political power. Below them were the plebeians, free citizens with limited political influence, and the vast numbers of slaves who formed the backbone of the economy. The family unit was central, governed by the paterfamilias, the male head who held absolute authority.
Culturally, the Romans were eclectic, absorbing and adapting elements from the civilizations they encountered, particularly the Greeks. Roman art, literature, and philosophy reflected this synthesis, creating a rich cultural tapestry. Latin, the Roman language, became the lingua franca of the Western world, influencing numerous modern languages.
Roman architecture and engineering achievements were monumental. They perfected the arch, vault, and dome, constructing enduring structures like the Colosseum, Pantheon, and aqueducts. These engineering marvels not only showcased Roman ingenuity but also served practical purposes, from public entertainment to water supply.
2. Energy Levels in the atom As we considered, the electrons in the atom can only occupy quantized orbits, i.e. energy levels. All electrons prefer to be in the lowest (unoccupied) energy level (lowest potential energy). That is why an electron at a higher energy level eventually falls in a lower level releasing a photon. We say there is a potential well in the atom where the top of the well is at zero potential and the other energy levels are at negative potential. The ground level will be at the lowest potential energy E = 0 eV E = -1.51 eV Higher Energy Levels E = -3.40 eV Ground State E = -13.61 eV
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4. The atom is left with one less electron in its electron cloud, so it becomes a positive ion
5. The energy needed for this jump is called IONIZATION ENERGYIonization Energy is the energy required to cause an electron to escape from the atom
8. A photon with just the right energy can hit an electron giving its energy for the electron to jump to the next energy levelThe energy of the photon must be exactly the same as the energy gap between the two level
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11. Excitation Energy In what region of the EM spectrum is the wavelength from the previous question? U.V. What energy photon would you need to ionize the atom? DE = 13.61 – 0 = 13.61 eV E = 0 eV E = -1.51 eV E = -3.40 eV E = -13.61 eV
12. Hydrogen Emission Spectrum Hydrogen is the simplest atom and so are its energy levels. When its only electron is excited to higher states, it can fall back to lower energy levels to emit different photons E = 0 eV E = -0.85 eV E = -1.51 eV E = -3.40 eV 1st excited state Balmer Series Ground State E = -13.61 eV Lyman Series
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14. In the Balmer Series the “relaxation” of the electron produces emission of visible light photonsHydrogen Emission Spectrum
15. Emission Spectra When the electrons of an atom are exited they can jump to higher energy levels, if the energy provided is just right to make the jump. When they jump back down a photon of energy hf = E1 – E2 is emitted. That is why an atom will emit only light with wavelength (i.e. colour) characteristic of the energy levels in the atom. Click on each energy level to reveal the emission spectrum of hydrogen
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18. Absorption Spectra and Stars We can study absorption spectra from stars to understand their composition. By looking at the Sun’s absorption spectrum can you tell which element is most abundant? Sun’s Absorption Spectrum Hydrogen Absorption Spectrum Hydrogen is the most abundant element in the Sun. In fact, the darkest lines in its spectrum match the wavelengths of the absorption spectrum of hydrogen.
19. The atom and energy levels A photon with energy hf = E1 – E2 hits the e-, which is exited to the next energy level. Electron: atomic particle orbiting around the nucleus. –ve charge and mass 1/1800 of a proton Neutron: neutral particle inside the nucleus. Different no of neutrons for the same element make different ISOTOPES of that element e- falls to a lower level and a photon with energy hf = E1 – E2 is released. Ground level: lowest energy state possible for the electrons. Electrons tend to fill this level 1st and “fall” in it after being exited. Proton: equal and opposite charge as e-. Slightly less mass than a neutron. Proton no: it tells the no of protons (and also electrons) in the atom. This no is a property of the element, so the atomic no tells what element the atom is. Nucleon no: given by the sum of no of protons and no of neutrons. Using this no you can identify the different isotopes of the same element. Higher energy levels: when not completely filled with e-, they can “host” exited e-. Click on different areas to reveal their properties E1 E2 7 Li e- falls back to ground level hf = E1 – E2 hf = E1 – E2 Exited e- jumps energy gap 3