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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.
- Fall '10