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A source of light is placed at a distance of 50 cm from a photocell and the stopping potential is found to be V₀. If the distance between the light source and photocell is made 25 cm, the new stopping potential will be

1. 2V₀
2. V₀/2
3. V₀
4. 4V₀

Correct answer: V₀

Solution

The stopping potential depends only on the frequency of the incident light and not on its intensity or distance from the source. Since the frequency remains unchanged, the stopping potential will remain V₀.

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