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In an Experiment Involving the Apparatus Shown in Figure Q4

Question 78

Multiple Choice

In an experiment involving the apparatus shown in figure Q4.1b, suppose that after shining light on the cathode long enough that the voltmeter settles down to a fixed value, we suddenly cut off the light. If the voltmeter is truly ideal, what happens to the value displayed?
In an experiment involving the apparatus shown in figure Q4.1b, suppose that after shining light on the cathode long enough that the voltmeter settles down to a fixed value, we suddenly cut off the light. If the voltmeter is truly ideal, what happens to the value displayed? A) It immediately drops to zero. B) It slowly decays to zero. C) It remains fixed. D) It does something else. (Describe what.)


A) It immediately drops to zero.
B) It slowly decays to zero.
C) It remains fixed.
D) It does something else. (Describe what.)

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