A source of light, of frequency greater than the threshold frequency,

1.	A source of light, of frequency greater than the threshold frequency, is placed at a distance ‘d’ from the cathode of a photocell. The stopping potential is found to be V. If the distance of the light source is reduced to d/n (where n > 1), explain the changes that are likely to be observed in the (i) photoelectric current and (ii) stopping potential.
Answer» on reducing the distance, intensity increases. Photoelectric current increases with the increase in intensity. Stopping potential is independent of intensity, and therefore remains unchanged.

A source of light, of frequency greater than the threshold frequency, is placed at a distance ‘d’ from the cathode of a photocell. The stopping potential is found to be V. If the distance of the light source is reduced to d/n (where n > 1), explain the changes that are likely to be observed in the (i) photoelectric current and (ii) stopping potential.

Answer»

on reducing the distance, intensity increases.

Photoelectric current increases with the increase in intensity.

Stopping potential is independent of intensity, and therefore remains unchanged.

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