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JCECE Engineering JCECE Engineering Solved Paper-2011

  • question_answer
    A photocell with a constant potential difference of \[V\] volt across it is illuminated by a point source from a distance of\[25\,\,cm\]. When the source is moved to a distance of\[1\,\,m\], the electrons emitted by the photocell

    A)  carry 1/4th their previous energy

    B)  are 1/6th as numerous as before

    C)   are 1/4th as numerous as before

    D)   carry 1/4th their previous momentum

    Correct Answer: A

    Solution :

    Photoelectric current I is directly proportional to intensity of light and intensity\[\propto \frac{1}{{{(\text{distance)}}^{2}}}\]


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