A point source of light is used in an experiment on photoelectric effect. Which of the following curves best represents the variation of photoelectric current ‘i’ with distance ‘d’ of the source from the emitter?

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A point source of light is used in an experiment on photoelectric effect. Which of the following curves best represents the variation of photoelectric current ‘i’ with distance ‘d’ of the source from the emitter?

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answer is D.

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Detailed Solution

Intensity: $I = \frac{P}{4 {πd}^{2}}$

Photocurrent depends on the intensity of the light. Hence, Photocurrent depends inversely on the square of the distance.

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