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C. Clark
C. Clark

4871 Structural distinctions. Entities, structures and - Philsci
4871 Structural distinctions. Entities, structures and - Philsci

Chapter 22 – Electromagnetic Waves
Chapter 22 – Electromagnetic Waves

Gupta 2014 Credit: Google Images for the pictures Chapter 1
Gupta 2014 Credit: Google Images for the pictures Chapter 1

... Atomic Emission Spectra: spectrum for specific wavelengths of light emitted from pure substances ...
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... • All mechanical waves require a medium through which to travel. • The medium is the material through which mechanical waves travel. • This type of wave transfers energy by the vibration of particles in a medium. One particle vibrates and then passes its energy to a particle next to it. So on and so ...
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... High power laser stories ("Laser in protons out") Some basic relations Laser plasmas as source of X-rays Atomic physics in laser plasmas Line shapes, broadening Lorentz, Doppler, Voigt profiles Stark broadening Microfields electron broadening Simulations Why are simulations important Pulse + prepuls ...
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AP Chemistry Second Semester Notes

... 3. inner (core) electrons + nucleus = core charge (+1 to +8) reinforcing  respond to external magnetic field 4. organization of the periodic table ...
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Chemistry Goal 4 - North Carolina Public Schools

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CHAPTER 8 PERIODIC RELATIONSHIPS AMONG THE ELEMENTS

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lesson 5

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extrinsic semiconductor

...  Acceptor impurity means it ready to accept an electron to form the covalent bond in semiconductor materials.  Trivalent atoms (three valence electrons in their outer most orbits) are called as acceptor impurities. Example: Aluminum, Gallium, Boron and Indium.  When a trivalent atom is added with ...
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AP Physics 2 Student Sample Question 2

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17.1 Electric Potential and Potential Difference

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University of LeicesterPLUMERef: PLM-PAY-DetectorProgress

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Course Title: Physical Science 9 A – Physics Highly Qualified

Course Title: Physical Science 9 A – Physics Highly Qualified
Course Title: Physical Science 9 A – Physics Highly Qualified

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Chemistry B2A Chapter 18 Oxidation

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Electricity and Magnetism

... ◦ Materials with small number of free electrons; inhibit flow of electrons ◦ Basically poor conductors ◦ Used to wrap conductors to preserve current and prevent leakage of electrons ◦ Types of insulators  Rubber cord, plastic around ESU or X-ray machine ...
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... FUSION – 2 or more small nuclei combine to one larger nucleus FISSION – 1 large nucleus splits to form two or more smaller nuclei A half-life is the time required for one-half of a radioisotope’s nuclei to decay into its products. The half-life of any particular radioisotope is constant and therefor ...
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CHAPTER 27 Continuum Emission Mechanisms Continuum

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Review Answers

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Organometallic Chemistry at the Magnesium− Tris (8

< 1 ... 53 54 55 56 57 58 59 60 61 ... 208 >

Photoelectric effect

The photoelectric effect is the observation that many metals emit electrons when light shines upon them. Electrons emitted in this manner can be called photoelectrons. The phenomenon is commonly studied in electronic physics, as well as in fields of chemistry, such as quantum chemistry or electrochemistry.According to classical electromagnetic theory, this effect can be attributed to the transfer of energy from the light to an electron in the metal. From this perspective, an alteration in either the amplitude or wavelength of light would induce changes in the rate of emission of electrons from the metal. Furthermore, according to this theory, a sufficiently dim light would be expected to show a lag time between the initial shining of its light and the subsequent emission of an electron. However, the experimental results did not correlate with either of the two predictions made by this theory.Instead, as it turns out, electrons are only dislodged by the photoelectric effect if light reaches or exceeds a threshold frequency, below which no electrons can be emitted from the metal regardless of the amplitude and temporal length of exposure of light. To make sense of the fact that light can eject electrons even if its intensity is low, Albert Einstein proposed that a beam of light is not a wave propagating through space, but rather a collection of discrete wave packets (photons), each with energy hf. This shed light on Max Planck's previous discovery of the Planck relation (E = hf) linking energy (E) and frequency (f) as arising from quantization of energy. The factor h is known as the Planck constant.In 1887, Heinrich Hertz discovered that electrodes illuminated with ultraviolet light create electric sparks more easily. In 1905 Albert Einstein published a paper that explained experimental data from the photoelectric effect as being the result of light energy being carried in discrete quantized packets. This discovery led to the quantum revolution. In 1914, Robert Millikan's experiment confirmed Einstein's law on photoelectric effect. Einstein was awarded the Nobel Prize in 1921 for ""his discovery of the law of the photoelectric effect"", and Millikan was awarded the Nobel Prize in 1923 for ""his work on the elementary charge of electricity and on the photoelectric effect"".The photoelectric effect requires photons with energies from a few electronvolts to over 1 MeV in elements with a high atomic number. Study of the photoelectric effect led to important steps in understanding the quantum nature of light and electrons and influenced the formation of the concept of wave–particle duality. Other phenomena where light affects the movement of electric charges include the photoconductive effect (also known as photoconductivity or photoresistivity), the photovoltaic effect, and the photoelectrochemical effect.
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