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Chapter 38: Q.70 (page 1117)
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?
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In a photoelectric-effect experiment, the stopping potential was measured for several different wavelengths of incident light. The data are as follows:
Use an appropriate graph of the data to determine
(a) the metal used for the cathode and
(b) an experimental value for Planck鈥檚 constant .
How much energy does it take to ionize a hydrogen atom that is in its first excited state?
Compton scattering is relevant not only to -ray photons but, even more so, to higher energy gamma-ray photons. Suppose a gamma-ray photon backscatter (i.e., is scattered back toward the source) from a free electron. Afterward, what is the electron鈥檚 velocity in ?
I The allowed energies of a simple atom are
a. Draw the atom's energy-level diagram. Label each level with the energy and the quantum number.
b. What wavelengths appear in the atom's emission spectrum?
c. What wavelengths appear in the atom's absorption spectrum?
I Two hydrogen atoms collide head-on. The collision brings both atoms to a halt. Immediately after the collision, both atoms emit a photon. What was the spec of each atom just before the collision?
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