KVPY Sample Paper KVPY Stream-SX Model Paper-5

  • question_answer
    When light of intensity \[{{I}_{1}}\] & frequency \[{{v}_{1}}\] is incident on a substance. Photo electric emission take place and variation potential (V) is as shown by curve (1) in the figure. However, if light of intensity \[{{I}_{2}}\] & frequency \[{{v}_{2}}\] falls on the same substance, photo electric current varies with potential as shown by curve (2) which of the following is correct -

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

    B) \[{{I}_{1}}>{{I}_{2}},\] \[{{v}_{1}}>{{v}_{2}}\]

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

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

    Correct Answer: C

    Solution :

    [C] Photo current \[\propto \] intensity \[\therefore \,\,\,{{I}_{1}}>{{I}_{2}}\] Higher the frequency of light higher then stopping potential \[\therefore \,\,\,{{v}_{2}}>{{v}_{1}}\]

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