Chapter 38: Q 11 (page 1113)
If an electron is in a stationary state of an atom, is the electron at rest? If not, what does the term mean?
No, the electron is not at rest.
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You need to design a photodetector that can respond to the entire range of visible light. What is the maximum possible work function of the cathode?
A incandescent lightbulb emits about of visible light. (The other are emitted as infrared radiation or lost as heat to the surroundings.) The average wavelength of the visible light is about , so make the simplifying assumption that all the light has this wavelength. How many visible-light photons does the bulb emit per second?
How would the graph of Figure 38.2 look if classical physics provided the correct description of the photoelectric effect? Draw the graph and explain your reasoning. Assume that the light intensity remains constant as its frequency and wavelength are varied.
The cosmic microwave background radiation is light left over from the Big Bang that has been Doppler-shifted to microwave frequencies by the expansion of the universe. It now fills the universe with 450 photons/cm3 at an average frequency of 160 GHz. How much energy from the cosmic microwave background, in MeV, fills a small apartment that has 95 m2 of floor space and 2.5-m-high ceilings?
Very large, hot stars—much hotter than our sun—can be identified by the way in which He+ ions in their atmosphere absorb light. What are the three longest wavelengths, in nm, in the Balmer series of He+?
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