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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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An experiment was performed in which neutrons were shot through two slits spaced 0.10 mm apart and detected 3.5 m behind the slits. Figure P38.49 shows the detector output. Notice the scale on the figure. To one significant figure, what was the speed of the neutrons?
Dinoflagellates are single-cell organisms that float in the world鈥檚 oceans. Many types are bioluminescent. When disturbed, a typical bioluminescent dinoflagellate emits 108 photons in a 0.10-s-long flash of wavelength 460 nm. What is the power of the flash?
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?
At what speed is an electron's de Broglie wavelength (a) , (b) , (c) , and (d) ?
A photoelectric-effect experiment finds a stopping potential of when light of is used to illuminate the cathode.
a. From what metal is the cathode made?
b. What is the stopping potential if the intensity of the light is doubled?
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