EM spectrum and energies - Electrons occupy discrete energy...

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Discussion Section 122 Electromagnetic Radiation, a.k.a. Light! Nicholas McConnell, GSI Each group has chosen a region of the electromagnetic spectrum to investigate. Your group’s band is: On the axis below, shade in the part that corresponds to your band (look at the whiteboard, note that 1 Angstrom = 1 x 10 -10 m). . .10 -11 m 10 -10 m 10 -9 m 10 -8 m 10 -7 m 10 -6 m 10 -5 m 10 -4 m 10 -3 m 10 -2 m 10 -1 m . . λ In convenient units, what are the minimum and maximum wavelengths for your band? λ min = λ max = Find the lowest frequency, min , of light in your band. What equation should you use? Which wavelength above is relevant? ν min = Would you be able to make a magnet “glow” in your band by moving it back and forth to create electromagnetic waves at an appropriate frequency?
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Atoms can be excited when they encounter photons of specific energies. When an atom absorbs a photon, the photon's energy gets transferred to an electron.
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Unformatted text preview: Electrons occupy discrete energy levels, which are different for every element and molecule. An electron-volt (eV) is a unit of energy often used by chemists and particle physicists. Atomic excitations typically occur at energies of around 10 eV. This class won't require you to convert eV into other energy units, but note for this problem that Planck's constant h has a value of about 4 x 10-15 eV / Hz. In electron-volts, what is the highest energy that a photon in your band can have? Consider a hypothetical element which gets excited at an energy of exactly 10 eV. If light from your band encounters a gas cloud of this element, will anything happen? Note: excitation is not the only thing that can happen to atoms when they encounter photons of sufficiently high energy....
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This note was uploaded on 09/18/2010 for the course ASTRON 05989 taught by Professor Filippenko during the Fall '10 term at University of California, Berkeley.

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EM spectrum and energies - Electrons occupy discrete energy...

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