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Chapter 38: Q 15 (page 1114)
55 keV x-ray photons are incident on a target. At what scattering angle do the scattered photons have an energy of 50 keV?
Scattering angle is equal to 86o.
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II Ultraviolet light with a wavelength of} shines on a gas of hydrogen atoms in their ground states. Some of the atoms are ionized by the light. What is the kinetic energy of the electrons that are freed in this process?
Metal 1 has a larger work function than metal 2. Both are illuminated with the same short-wavelength ultraviolet light. Do photoelectrons from metal 1 have a higher speed, a lower speed, or the same speed as photoelectrons from metal 2? Explain.
In the following Figure is an energy-level diagram for a simple atom. What wavelengths, in nm, appear in the atom鈥檚 (a) emission spectrum and (b) absorption spectrum?
Very large, hot stars鈥攎uch hotter than our sun鈥攃an be identified by the way in which He+ ions in their atmosphere absorb light. What are the three longest wavelengths, in nm, in the Balmer series of He+?
How much energy does it take to ionize a hydrogen atom that is in its first excited state?
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