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The graph shows the variation of photoel...


The graph shows the variation of photoelectric current with accelerating potential of different intensities.
a. What conclusion do you arrive from the graph?
b. Photoelectric current is not zero even if the accelerating voltage is zero. Justify your answer.
c. Why two curves meet at one point on the retarding potential axis ?

Text Solution

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a. As intensity increases, intensity of photocurrent also increases.
b. Because all electrons are not ejected with same KE. When acceleration voltage is zero, these electrons are ejected with same velocity and can reach the collecting electrode,
c. The frequency of incident light is the same for `I_(1) and I_(2)`.
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