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14.2 Check and Reflect
Please complete the following questions. Due Thursday, April 24th @ 8:00 am.
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1. What si the energy, in eV of a 400 nm photon? (number only)
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2. Explain how the concepts of work function and threshold frequency are related.
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3. What is the threshold frequency for cadmium? See page 712, table 14.1
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4. Will a 500 nm photon cause the emission of an electron from a cesium metal surface? Explain why or why not.
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5. What stopping voltage is needed to stop an electron of kinetic energy 1.25 eV? (number only)
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6. Explain how stopping potential is related to the max kinetic energy of an electron.
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7. True or false: the greater the intensity of the light hitting a metal surfacem, the greater the stopping potential required to stop photoelectrons. Explain your answer.
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9. After completing question 8 on your own, give the value of the slope of the graph that you just drew. What is the significance of this value/
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10. What metal do you think was used in the previous example? Justify your answer.
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12. In several paragraphs, identify three common devices that use the photoelectric effect. Be sure to explain in what way these devices use the photoelectric effect.
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