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JEE Main & Advanced Physics Photo Electric Effect, X- Rays & Matter Waves Question Bank Photon and Photoelectric Effect

  • question_answer
    A photocell is illuminated by a small bright source placed 1 m away. When the same source of light is placed \[\frac{1}{2}m\] away, the number of electrons emitted by photo cathode would            [CBSE PMT 2001; AIEEE 2005]

    A)            Decrease by a factor of 2

    B)            Increase by a factor of 2

    C)            Decrease by a factor of 4

    D)            Increase by a factor of 4

    Correct Answer: D

    Solution :

               Number of photoelectrons µ \[\frac{1}{{{(\text{Distance})}^{2}}}\].


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