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Chapter 38: Q. 1 (page 1114)
Which metals in Table 38.1 exhibit the photoelectric effect for (a) light with and (b) light with ?
a. Sodium
b. Iron.
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An FM radio station broadcasts with a power of 10 kW at a frequency of 101 MHz.
a. How many photons does the antenna emit each second?
b. Should the broadcast be treated as an electromagnetic wave or discrete photons? Explain.
FIGURE Q38.12 shows the energy-level diagram of Element X.
a. What is the ionization energy of Element X?
b. An atom in the ground state absorbs a photon, then emits a photon with a wavelength of 1240 nm. What was the energy of the photon that was absorbed?
c. An atom in the ground state has a collision with an electron, then emits a photon with a wavelength of 1240 nm. What conclusion can you draw about the initial kinetic energy of the electron?
How much energy does it take to ionize a hydrogen atom that is in its first excited state?
What is the energy, in eV, of (a) a 450 MHz radio-frequency photon, (b) a visible-light photon with a wavelength of 450 nm, and (c) an x-ray photon with a wavelength of 0.045 nm?
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 ?
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