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. Figure Q28.5 shows the typical photoelectric behavior of a metal as the anode-cathode potentialdifference AVis varied.a. Why do the curves become horizontal for AV? 1V? Shouldn't the current increase as thepotential difference increases? Explain.b. Why doesn't the current immediately drop to zero for AV<0 V? Shouldn't AV<0V preventthe 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)10AV (V)-3 -2 -112FIGURE Q28.5

A graph for photoelectric current versus potential difference between anode-cathodeis given in the…

Answered: 3) Figure Q28.5 shows the typical…

Modern Physics

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ISBN:9781111794378

Author:Raymond A. Serway, Clement J. Moses, Curt A. Moyer

Publisher:Raymond A. Serway, Clement J. Moses, Curt A. Moyer

Chapter3: The Quantum Theroy Of Light

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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.

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
1
2
FIGURE Q28.5

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