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

  • question_answer
    When a point source of light is at a distance of one metre from a photo cell, the cut off voltage is found to be V. If the same source is placed at 2 m distance from photo cell, the cut off voltage will be

    A)            V    

    B)            V/2

    C)            V/4

    D)            \[V/\sqrt{2}\]

    Correct Answer: A

    Solution :

               By changing distance of source, photoelectric current changes. But there is no change in stopping potential.


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