3) Figure Q28.5 shows the typical photoelectric behavior of a metal as the anode-cathode potential difference AVis varied. a. Why do the curves become horizontal for AV? 1V? Shouldn't the current increase as the potential difference increases? Explain. b. Why doesn't the current immediately drop to zero for AV<0 V? Shouldn't AV<0V prevent the electrons from reaching the anode? Explain. c. The current is zero for AV<-2.0 V. Where do the electrons go? Are no electrons emitted if AV <-2.0 V? Or if they are, why is there no current? Explain. I (µA) 10 AV (V) -3 -2 -1 0 1 2 FIGURE Q28.5
3) Figure Q28.5 shows the typical photoelectric behavior of a metal as the anode-cathode potential difference AVis varied. a. Why do the curves become horizontal for AV? 1V? Shouldn't the current increase as the potential difference increases? Explain. b. Why doesn't the current immediately drop to zero for AV<0 V? Shouldn't AV<0V prevent the electrons from reaching the anode? Explain. c. The current is zero for AV<-2.0 V. Where do the electrons go? Are no electrons emitted if AV <-2.0 V? Or if they are, why is there no current? Explain. I (µA) 10 AV (V) -3 -2 -1 0 1 2 FIGURE Q28.5
Principles of Physics: A Calculus-Based Text
5th Edition
ISBN:9781133104261
Author:Raymond A. Serway, John W. Jewett
Publisher:Raymond A. Serway, John W. Jewett
Chapter28: Quantum Physics
Section: Chapter Questions
Problem 15P
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Figure Q28.5 shows the typical photoelectric behavior of a metal as the anode-cathode potential difference ΔV is varied.
a. Why do the curves become horizontal for ΔV ? 1V? Shouldn’t the current increase as the potential difference increases? Explain.
b. Why doesn’t the current immediately drop to zero for ΔV < 0 V? Shouldn’t ΔV < 0 V prevent the electrons from reaching the anode? Explain.
c. The current is zero for ΔV < -2.0 V . Where do the electrons go? Are no electrons emitted if ΔV < -2.0 V? Or if they are, why is there no current? Explain.
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