Manipal Medical Manipal Medical Solved Paper-2007

  • question_answer
    In a p-n junction photo cell, the value of the photo-electromotive  force  produced  by monochromatic light is proportional to the

    A)  barrier voltage at the p-n junction

    B)  intensity of the light falling on the cell

    C)  frequency of the light failing on the cell

    D)  voltage applied at the p-n junction

    Correct Answer: B

    Solution :

     In a photoconductive cell, when monochromatic light is incident on the transparent metallic film, a force produced called the photo-electromotive, stimulates the emission of an electric current when photovoltaic action creates a potential difference between two points. The magnitude of this current depends upon the intensity of incident light. Hence, photo-electromotive force produced by monochromatic light is proportional to the intensity of light falling on the cell.


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