In a photoelectric effect experiment a light of frequency 1.5 times the threshold frequency is made to fall on the surface of photosensitive material…

Question

In a photoelectric effect experiment a light of frequency 1.5 times the threshold frequency is made to fall on the surface of photosensitive material. Now if the frequency is halved and intensity is doubled, the number of photo electrons emitted will be:

MARKS Content Team · Accepted Answer

Correct answer: (C) Zero. Given, f_i=f_0. Now, f=f_i2=f_02. Since f_02<f_0 i.e. the incident frequency is less than threshold frequency. Hence, there will be no emission of photoelectrons. Therefore, current =0 and no photo electrons will be emitted.

In a photoelectric effect experiment a light of frequency $1.5$ times the threshold frequency is made to fall on the surface of photosensitive material. Now if the frequency is halved and intensity is doubled, the number of photo electrons emitted will be:

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