In a photoelectric effect experiment a light of frequency 1 . 5...

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:

Options

ADoubled
BQuadrupled
CZero
DHalved

Correct answer

C. Zero

Step-by-step solution

Given, ${f}_{i} = {f}_{0}$ . Now, $f = \dfrac{{f}_{i}}{2} = \dfrac{{f}_{0}}{2}$ .

Since $\dfrac{{f}_{0}}{2} < {f}_{0}$ 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.

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