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I (µA) 10- AV (V) -3 -2 -1 0 1 2 3 FIGURE Q28.6

I (µA) 10- AV (V) -3 -2 -1 0 1 2 3 FIGURE Q28.6

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Shown is 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 ≳ 1 V? 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 6 -2.0 V? Or if they are, why is there no current? Explain.

I (µA) 10- AV (V) -3 -2 -1 0 1 2 3 FIGURE Q28.6
Transcribed Image Text:I (µA) 10- AV (V) -3 -2 -1 0 1 2 3 FIGURE Q28.6
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