When you increase only the frequency of the incoming light onto the emitter, you measure

A. An increased current
B. A decrease in the necessary stopping voltage
C. An increase in the necessary stopping voltage
D. No change in either current or stopping voltage
E. Either a or c. You cannot determine which from the information given.


Changes in stopping voltage change the necessary energy to bridge the emitter-collector gap. The increase in the frequency of light means that the ejected electrons have greater kinetic energy. An increase in the necessary stopping voltage would mean that the most energetic electrons—the new, higher energy electrons—would bridge the gap. Since the increase in frequency will not free more electrons, the current should stay the same.
C.

Physics & Space Science

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