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Light
Light

Lecture 29 - Purdue Physics
Lecture 29 - Purdue Physics

... Magnitude of the Transverse Electric Field We can qualitatively predict the direction. What is the magnitude? Magnitude can be derived from Gauss’s law Vectors a, r and E always in one plane ...
P3A3B Atomic Physics Notes 2013
P3A3B Atomic Physics Notes 2013

student worksheets
student worksheets

... each other (North-South-North-South etc). When the electrons pass between the magnets they are forced in one direction and then the other, they undulate or wiggle. This motion increases the intensity of radiation that is emitted and can be used for experiments. Using the Simulator 1. Click on the bu ...
AstronomicalSpectroscopy
AstronomicalSpectroscopy

... Atomic Absorption Lines • An absorption line is formed when an electron makes a transition from a lower to a higher discrete energy state, with a photon being absorbed in the process. • These absorbed photons generally come from background continuum radiation and a spectrum will show a drop in the ...
The Nature of Light (PowerPoint)
The Nature of Light (PowerPoint)

... Electrons in glass have a natural vibration frequency in the ultraviolet range. When ultraviolet light shines on glass, resonance occurs as the wave builds and maintains a large vibration between the electron and the atomic nucleus, just as a large vibration is built when pushing someone at the reso ...
PARTICLE PHYSICS
PARTICLE PHYSICS

... radiation is quantized; that is, it’s emitted in little “packets” of energy, photons, proportional to the frequency ν: ...
ESSR_PNE_ElectroSpectrum_V01.pps
ESSR_PNE_ElectroSpectrum_V01.pps

chap3 (WP)
chap3 (WP)

Antimatter
Antimatter

... Dirac and Antimatter In 1927 Paul Dirac was working on the problem of combining the theory of the very small (quantum mechanics) with Einstein’s special theory of relativity. ...
lecture 8
lecture 8

... Technically, the proper way to describe this situation is to consider the nuclear potential well, the Coulombic barrier, and quantummechanical barrier tunneling. Why not just create a nucleus with neutrons only, or just a single proton and varying numbers of neutrons, in which case there would be no ...
Midterm Review.ppt - Chemistry R: 4(AE)
Midterm Review.ppt - Chemistry R: 4(AE)

Electron configuration
Electron configuration

... • There are three rules: • 1. Aufbau Principle: each electron fills the lowest energy orbital available 1st. • 1s is the lowest energy level, always filled first • 2. Pauli's Exclusion Principle: a maximum of two electrons may occupy a single sub-orbital, but only if they have opposite spins. • Elec ...
The Periodic Table - Mrs Molchany`s Webpage
The Periodic Table - Mrs Molchany`s Webpage

Chapter 7 The Quantum-Mechanical Model of the Atom
Chapter 7 The Quantum-Mechanical Model of the Atom

Chemistry Review - Net Start Class
Chemistry Review - Net Start Class

B - Piazza
B - Piazza

Atoms and Elements Notes
Atoms and Elements Notes

... Nobel Gases ...
Draw atomic models showing the appropriate number of electrons
Draw atomic models showing the appropriate number of electrons

Energy - Reocities
Energy - Reocities

Chapter 7 The Electronic Structure of Atoms
Chapter 7 The Electronic Structure of Atoms

... ________________________ (l) is the distance between identical points on successive waves. _________________________ is the vertical distance from the midline of a wave to the peak or trough. ________________________ (n) is the number of waves that pass through a particular point in 1 second (Hz = 1 ...
Chapter 5 Electrons in Atoms
Chapter 5 Electrons in Atoms

... J.J. Thomson won the Nobel prize for describing the electron as a particle. His son, George Thomson won the Nobel prize for describing the wave-like nature of the electron. The electron is a particle! ...
Exam 2 Form N - TAMU Chemistry
Exam 2 Form N - TAMU Chemistry

... 11. Which of the following statements DOES NOT depend upon the quantization of energy? a) Light has the characteristics of both a wave and a particle. b) The number of electrons ejected from a metal surface irradiated with visible light does not depend on the color of the light as long as the light ...
Solutions of Chapter 4 4.1. Compare light microscopy, transmission
Solutions of Chapter 4 4.1. Compare light microscopy, transmission

... Backscattering electrons cannot generate the same levels of resolution as the secondary electrons. BSEs with higher energy than SEs can escape from a larger volume under a specimen surface than SEs as shown in Fig. 4.10. Thus, the lateral resolution of BSEs is worse than that of SEs. 4.7. In a SEM ...
(Electromagnetic Wave).
(Electromagnetic Wave).

... time that it took light to make a round trip between two mountains in California that were 21.7 miles apart using mirrors. Michelson’s value for the speed of light was calculated as 186,300 miles/second. ...
< 1 ... 148 149 150 151 152 153 154 155 156 ... 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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