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

  • question_answer
    When an inert gas is filled in the place vacuum in a photo cell, then                                          [MP PMT 1997]

    A)            Photo-electric current is decreased

    B)            Photo-electric current is increased

    C)            Photo-electric current remains the same

    D)            Decrease or increase in photo-electric current does not depend upon the gas filled

    Correct Answer: B

    Solution :

               In the presence of inert gas photoelectrons emitted by cathode ionise the gas by collision and hence the current increases.


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