Chapters 11 14 review
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This document covers key concepts in physics including: 1. Waves can transfer energy through a medium or space, with the medium moving perpendicular to the wave's direction of travel. 2. Electromagnetic waves such as radio waves, microwaves, infrared, visible light, ultraviolet, X-rays and gamma rays have different wavelengths and frequencies. 3. Reflection is when a wave bounces off an object, following the law that the angle of incidence equals the angle of reflection.
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Describe and explain how sound travels in each: Solids: Liquids: Gas: Outer Space: List an
example for each kind of energy transfer: Thermal to electrical: Electrical to mechanical:
Mechanical to sound: Electrical to light: Define and give an example of each term as it relates
to light: Reflection: Refraction: Absorption: Lens: Define each term as it relates to electricity:
Open circuit: Closed Circuit:
Solution
1) Sound travels in different forms in different medium
Solids:
In solids, sound waves travel as both longitudinal as well as transverse waves. Longitudinal
waves are alternate regions of compressions and rarefractions caused by pressure deviations from
the mean pressure. On the other hand, transverse waves are caused by alternate regions of shear
stress developed perpendicular to the direction of propogation of the sound wave.
Liquids:
In liquids, sound travels through alterante regions of high pressure(compression) and low
pressure(rarefraction). Such type of waves are known as longitudinal waves. The source causing
the sound vibrates, thus compressing and expanding the air in the region near the source. This
gets propogated in space through longitudinal waves.
Gasses:
Like in liquids, sound travels through through longitudinal waves in gasses too.. The source
causing the sound vibrates, thus compressing and expanding the air in the region near the source.
This gets propogated in space through longitudinal waves.
Outer Space:
Sound requires some medium for propogation. Since outer space is devoid of any matter, sound
does not travel in outer space.
2)
Thermal to Electrical: Thermoelectric generators, Thermocouples etc
Electrical to Mechanical: AC Generator
Mechanical to sound: Bells, Percussion Instruments
Electrical to light: Torch light, Light Bulbs
3)
Reflection: The change in direction of light wave on hitting a surface is known as reflection. Eg:
Mirror
Refraction: Bending of light wave as it travels from one medium to another is known as
refration. refraction mainly happens due to difference in the refractive index between to the two
mediums. Eg: Contact lens, lens in microscopes
Absorption: The phenomenon by which light wave could be absorbed by a material when
incident on it is known as absorption. Eg: Absorption of light by chlorophyl for photosynthesis
Lens: lens is an optical device that bends light in a required fassion through refraction. depending
on the requirement and the shape of the lens, it can be used to focus the light beam or disperse.
Eg: Contact lens
4)
Open circuit: An electrical circuit without a complete path between the terminals of the power
source is known as open circuit
Closed circuit: An electrical circuit with atleast one complete path between the terminals of the
power source is known as open circuit.
i AM YEDA
1. Sound is produced due to the vibration of objects and needs a medium like air, water or other materials to travel through.
2. As sound travels through a medium, it causes compressions and rarefactions that propagate the vibrations as a longitudinal wave.
3. The human ear detects sound waves that are converted into electrical signals in the cochlea and transmitted to the brain for interpretation. Frequencies between 20-2000 Hz can be heard by humans.
sol_ther_lecture2.pptx
1) The document discusses concepts related to heat transfer through thermal radiation including Planck's law, Wien's displacement law, and the Stefan-Boltzmann equation. 2) It introduces the concepts of blackbody and graybody radiation and how real surfaces have radiation properties that depend on wavelength and direction. 3) Key radiation properties discussed include emissivity, absorptivity, reflectivity, and transmissivity as well as Kirchhoff's law relating these properties.
LIGHT.pptx
The document discusses the history of theories about the nature of light from ancient Greece to modern times. Key figures proposed light as particles, waves, or both. It was determined that light travels at a finite speed and is part of the electromagnetic spectrum. The modern view is that light exhibits both wave and particle properties. The document also covers related topics like polarization, shadows, and 3D viewing.
Tunay na presentation sa physics
The document summarizes key concepts about the particle and wave properties of light. It discusses (1) Newton's corpuscular theory of light and the establishment of the wave theory by Huygens, (2) wave phenomena such as reflection, refraction, diffraction and interference, (3) the photoelectric effect and how Einstein's photon theory explained experimental observations, and (4) provides an example calculation of determining the work function of a metal from photoelectric emission data.
Wave theory
1. Huygen's wave theory proposes that light propagates as waves, with each point on a wavefront acting as a secondary source of spherical wavelets.
2. The wave theory can explain phenomena like reflection, refraction, and interference through Huygen's principle and the laws of reflection and refraction.
3. Maxwell's electromagnetic theory unified electric and magnetic fields and correctly predicted the speed of light, providing strong evidence for the wave nature of light.
Physics P1.5
P1.5 Presentation.
Useful for revision for exams as it contains accurate information.
It includes:
- What are Waves
- Waves Definitions
- Energy Transfer
- Wave Speed
- Frequency & Time Period
- Light & Sound
- Reflection
- Refraction
- Diffraction
- Measuring Waves
- Oscilloscopes
- Ray Diagrams
- Using Light
- Red Shift
- The Big Bang Theory
This final presentation completes the whole of Physics (P1). This'll hopefully become part of a bigger collection of other science topics, soon to be uploaded.
Thank You. To all of you out there who may find my presentation helpful in any way, shape or form.I pleased to now be able to say the P1 Collection is now complete. Soon I'll be uploading other presentation on Physics, such as; P2 & P3 Hope you find these presentations useful and helpful for exams or just general revision. More presentation coming soon on this channel, JaskiratK.
See You Soon,
Jaskirat
Created By: JaskiratK
Uploaded By: JaskiratK
Information By: BBC Bitesize
Pictures/Images/Diagram: Google, BBC Bitesize
Slideshare: http://www.slideshare.net/JaskiratK
Prezi: https://prezi.com/user/mrnfvgaamzxe/
chapter_12 Modified.ppt
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Chpt.2.2
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Chpt.2.1
Ecology is the scientific study of the interactions between organisms and their environments. It reveals the interrelationships between living (biotic) and nonliving (abiotic) parts of the world. Key concepts in ecology include the biosphere, biotic factors, abiotic factors, levels of organization (organism, population, community, ecosystem, biome, biosphere), habitats, niches, and symbiosis (commensalism, mutualism, parasitism). Ecology combines information from various sciences to understand these relationships.
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Aristotle first classified organisms as either animals or plants, with plants grouped by size and animals by whether they had blood. Linnaeus broadened Aristotle's system and created the first formal taxonomy, grouping organisms into a binominal nomenclature with a genus and species name. The taxonomic categories from most specific to broad are species, genus, family, order, class, phylum, kingdom, and domain.
Chpt. 15.1
Charles Darwin developed the theory of evolution by natural selection based on his observations as a naturalist aboard the HMS Beagle in the 1830s. While visiting the Galapagos Islands, Darwin noticed that related but distinct animal species inhabited different islands. He later concluded that populations on the mainland evolved over generations as they adapted to their local environments, with better adapted traits being passed down. Darwin's theory proposed that natural selection drives evolution, as organisms better suited to their environment will survive and reproduce, passing on their favorable traits.
Chapter 11.3 notes
A karyotype is a micrograph that arranges homologous chromosome pairs in decreasing size order. It is used to study chromosomes stained during cell metaphase. Nondisjunction is a cell division error where sister chromatids do not separate properly, which can cause conditions like Down syndrome.
Chpt. 11.2 complex inheritance leftovers
Sickle-cell anemia is an autosomal recessive trait common in those with African and Mediterranean ancestry. It causes abnormally shaped red blood cells, impaired blood flow, tissue damage, and health issues. Sex is determined by the 23rd pair of chromosomes - females have XX and males have XY. The X chromosome carries many genes needed for development in both sexes. To compensate for having two X chromosomes, females inactivate one randomly. Sex-linked traits are on the X chromosome and are always expressed if recessive in females. Muscular dystrophy is an X-linked recessive disease. Polygenic traits like skin and eye color are influenced by two or more genes and result in a range of intermediate phenotypes.
Chapter 11.1 notes
This document summarizes several human genetic disorders including their inheritance patterns, symptoms, prevalence, and treatment options. Huntington's disease is an autosomal dominant neurological disorder with onset between 30-50 years of age that is always fatal. Cystic fibrosis is the most common lethal genetic disorder among white Americans, affecting the lungs and digestive system due to thick mucus production, with current treatments improving life expectancy. Tay-Sachs disease causes neurological deterioration and death by age 5 due to fatty acid accumulation in the brain.
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The document discusses different patterns of inheritance beyond simple dominance:
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Chapter 12.2 dna replication
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Meiosis
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Chapter 2
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Chapter 3
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