2. Questions Bank
  3. JEE Main & Advanced
  4. Physics
  5. Photo Electric Effect, X- Rays & Matter Waves

JEE Main & Advanced Physics Photo Electric Effect, X- Rays & Matter Waves Question Bank Self Evaluation Test - Dual Nature of Radiation and Matter

  • question_answer
    The cathode of a photoelectric cell is changed such that the work function changes from \[{{W}_{1}}\] to \[{{W}_{2}}({{W}_{2}}>{{W}_{1}}).\] If the current before and after changes are \[{{I}_{1}}\] and \[{{I}_{2}}\]. all other conditions remaining unchanged, then (assuming \[hv>{{W}_{2}}\])

    A) \[{{I}_{1}}={{I}_{2}}\]                      

    B) \[{{I}_{1}}<{{I}_{2}}\]

    C) \[{{I}_{1}}>{{I}_{2}}\]                      

    D) \[{{I}_{1}}<{{I}_{2}}<2{{I}_{1}}\]

    Correct Answer: A

    Solution :

    [a] The work function has no effect on photoelectric current so long as \[hv>{{W}_{0}}.\]  The photoelectric current is proportional to the intensity of incident light. Since there is no change in the intensity of light, hence \[{{I}_{1}}={{I}_{2}}\].


You need to login to perform this action.
You will be redirected in 3 sec spinner