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VIT Engineering VIT Engineering Solved Paper-2014

  • question_answer
    If the distance of 100 W lamp is increased from a photocell, the saturation current i in the photocell varies with the distance d as

    A) \[i\propto {{d}^{2}}\]                    

    B) \[i\propto d\]

    C) \[i\propto \frac{1}{d}\]                                

    D) \[i\propto \frac{1}{{{d}^{2}}}\]

    Correct Answer: D

    Solution :

    Photoelectric current depends on the intensity of incident radiation i.e.,                             \[i\propto l\] But, intensity of radiation \[l\propto \frac{1}{{{d}^{2}}}\]                              \[i\propto \frac{1}{{{d}^{2}}}\]


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