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(a) 2V₀(b) V₀/2(c) V₀(d) 4V₀
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Cutoff potential only depends upon the frequency of the radiated light. It is independent of the intensity ie the number of photons striking the metal surface per unit time. So even though intensity is increasing, the cutoff potential will stay the same.
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Answer:
Explanation:
Distance from where the source of light is placed = 50cm (Given)
Stopping potential = V0 (Given)
Distance between the light source and photocell = 25cm (Given)
The stopping potential is described as the potential that is necessary to stop any electron, or to even stop the electron that has the most kinetic energy. V always depends on the frequency and not on the intensity of the radiations. Since, the stopping potential is independent of distance, thus the new stopping potential will remain unchanged.
Therefore, the new stopping potential = V₀.
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