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Chapter 38: Q 14 (page 1114)
What is the energy, in keV, of 75 keV x-ray photons that are backscattered (i.e., scattered directly back toward the source) by the electrons in a target?
Energy of the x-ray photons is 58 keV.
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Calculate all the wavelengths of visible light in the emission spectrum of the hydrogen atom.
How much energy does it take to ionize a hydrogen atom that is in its first excited state?
Potassium and gold cathodes are used in a photoelectric effect experiment. For each cathode, find:
a) The threshold frequency.
b) The threshold wavelength.
c) The maximum photoelectron ejection speed if the light has a wavelength of 220 nm.
d) The stopping potential if the wavelength is 220 nm
The first three energy levels of the fictitious element X were shown in FIGURE P38.56. An electron with a speed of 1.4 X 106 m/s collides with an atom of element X. Shortly afterward, the atom emits a photon with a wavelength of 1240 nm. What was the electron's speed after the collision? Assume that, because the atom is much more massive than the electron, the recoil of the atom is negligible. Hint: The energy of the photon is not the energy transferred to the atom in the collision.
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 .
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