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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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A ruby laser emits an intense pulse of light that lasts a mere 10 ns. The light has a wavelength of 690 nm, and each pulse has an energy of 500 mJ. a. How many photons are emitted in each pulse? b. What is the rate of photon emission, in photons per second, during the 10 ns that the laser is “on”?
The wavelengths of light emitted by a firefly span the visible spectrum but have maximum intensity near 550 nm. A typical flash lasts for 100 ms and has a power output of 1.2 mW. How many photons does a firefly emit in one flash if we assume that all light is emitted at the peak intensity wavelength of 550 nm?
A ruby laser emits an intense pulse of light that lasts a mere . The light has a wavelength of , and each pulse has an energy of .
a. How many photons are emitted in each pulse?
b. What is the rate of photon emission, in photons per second, during the that the laser is “on”?
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?
Which metals in Table 38.1 exhibit the photoelectric effect for (a) light with and (b) light with ?
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