JEE Main & Advanced Physics Photo Electric Effect, X- Rays & Matter Waves Question Bank Topic Test - Photo Electric Effect, X-Rays & Matter Waves

  • 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 :

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

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