Chapter 9 hw
CHAPTER 9 HOMEWORK
Use the following to answer questions 1-2:
Although Albert Einstein is best known for his theories of relativity, his theory of the 
photoelectric effect was also a major developement in 20th century physics.  He received the 
Nobel Prize in Physics for his work on the photoelectric effect - not the Theory of General 
Relativity.
1. What is the photoelectric effect?  Give an example of a device that uses the 
photoelectric effect in everyday life.
2. Describe two things about the photoelectric effect that could only be explained with 
Einstein's theory.
Use the following to answer questions 3-4:
Figure 9.9a shows light from an electric arc passing through a prism, projecting a rainbow of 
color.
3. Referring to Chapter 7, what is the name of the physical effect in the glass of the prism 
that makes the white light split into a rainbow?  How does this effect make the white 
light separate into a rainbow?
4. What phenomenon, shown in Figure 9.3, makes a hot electric arc produce a rainbow 
spectrum?  What information can be obtained from such a spectrum?
Use the following to answer questions 5-6:
Figure 9.9b and 9.9c show two special types of spectra which have bright or dark lines at various 
wavelengths.
5. What is the name of the type of spectrum shown in Figure 9.9b?  What is the name of 
the spectrum in 9.9c?
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6. How does Niels Bohrs theory explain the spectrum in 9.9b? You may wish to refer to 
Figures 9.12 and 9.13.
7. Lasers produce light that is very different from the light of a common light bulb. 
Describe at least two ways that laser light is different. You may wish to refer to Figure 
9.17 and the surrounding discussion.
8. Explain how a microwave oven uses electromagnetic radiation to heat food

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