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JCECE Medical JCECE Medical 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 \[\text{intensity}\propto \frac{1}{{{(distance)}^{2}}}\]


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