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Question

In a photoelectric effect experiment, if 'f' is the frequency of incident radiation on the metal surface and 'I' is the intensity of the incident radiation, then

A
If 'f' is increased keeping 'I' and work function constant, saturation current increases.
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B
If 'I' is increased keeping 'f' and work function contant saturation current increases.
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C
If work function is decreased keeping 'f' and 'I' constant, then stopping potential increases but saturation current remains same.
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D
On increasing distance between cathod and anode, stopping potential remains same.
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Solution

The correct options are
B If 'I' is increased keeping 'f' and work function contant saturation current increases.
C If work function is decreased keeping 'f' and 'I' constant, then stopping potential increases but saturation current remains same.
D On increasing distance between cathod and anode, stopping potential remains same.
Option A) If intensity is same and the frequency is increased, then the photon flux doesn't change, only maximum K.E of ejected electrons increases.
Option B) If intensity is increased while keeping 'f' constant, the photon flux increases. So, the current increases.
Option C) If work function is decreased while everything is same, the KE of the photo electrons increases but the number of photo electrons remains the same.
Option D) Stopping potential only depends on the K.E of the electron.

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