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Photoelectric effect - Wikipedia
Electromagnetic radiation - Wikipedia
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Basics of Light – Physics 132: What is an Electron? …
An electron in an outer energy level of an atom falls to a lower energy level. There’s a change in energy as the electron falls, that energy has to go somewhere. It goes into the release of light. Electrons changing energy levels, however, is not the only way to produce light.
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Notes on Light (Electromagnetic Radiation)
where h is ``Planck's constant'' = 6.626 * 10-36 J…s.. At the beginning of the 20th century Max Planck discovered that if we consider light as packets of energy called photons, we can accurately explain the shape of continuous spectra.A photon is a particle of electromagnetic radiation. Bizarre though it may be, light is both a particle and a wave.
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Electromagnetic spectrum - Wikipedia
Visible light (and near-infrared light) is typically absorbed and emitted by electrons in molecules and atoms that move from one energy level to another. This action allows the chemical mechanisms that underlie human vision and plant photosynthesis. The light that excites the human visual system is a very small portion of the electromagnetic spectrum.
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Electromagnetic Radiation - an overview | …
Electromagnetic radiation is a form of energy that propagates as both electrical and magnetic waves traveling in packets of energy called photons. There is a spectrum of electromagnetic radiation with variable wavelengths and frequency, which in turn imparts different characteristics.
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The Basics of Light
The sun as it appears in X-ray light (left) and extreme ultraviolet light (right). Light as energy ... If left undisturbed, our hydrogen atom likes to bind its electron as tightly as it can, and so we would find the electron in the lowest energy level, which is called the "ground state." However, if our atom is immersed in a beam of light from ...
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Electromagnetic radiation - Wikipedia
James Clerk Maxwell derived a wave form of the electric and magnetic equations, thus uncovering the wave-like nature of electric and magnetic fields and their symmetry. Because the speed of EM waves predicted by the wave equation coincided with the measured speed of light, Maxwell concluded that light itself is an EM wave. Maxwell's equations were confirmed by Heinrich Hertz through experiments with radio waves. Maxwell realized that since a lot of physics is symmetrical and mathematically artistic in a way…
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How is electromagnetic radiation related to the speed of light?
Classically, electromagnetic radiation consists of electromagnetic waves, which are synchronized oscillations of electric and magnetic fields that propagate at the speed of light, which, in a vacuum, is commonly denoted c.
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What are the energies of photons in the electromagnetic spectrum?
Instead of using wavelengths, astronomers that study these portions of the EM spectrum usually refer to these photons by their energies, measured in electron volts (eV). Ultraviolet radiation falls in the range from a few electron volts to about 100 eV. X-ray photons have energies in the range 100 eV to 100,000 eV (or 100 keV).
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Why do electrons radiate photons around the field?
The net effect of this is to cause the particle to spiral around the direction of the field. Since circular motion represents acceleration (i.e., a change in velocity), the electrons radiate photons of a characteristic energy, corresponding to the radius of the circle.
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What makes X-ray light different from other types of light?
Each photon of X-ray light contains a lot of energy in comparison with, say, an optical or radio photon. It is this "energy content per photon" that is one of the distinguishing characteristics of the different ranges of light described above.
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