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

  • question_answer
    A light of wavelength \[\lambda \] and intensity l is incident normally on the surface. If reflection coefficient of surface is r, the pressure exerted by light on the surface is equal to

    A) \[\frac{2I}{c}\]

    B) \[\frac{I}{c}r\]

    C) \[\frac{I}{c}\left( I+r \right)\]

    D) \[\frac{I}{c}\left( I-r \right)\]

    Correct Answer: C

    Solution :

    [c] \[F=\frac{dP}{dt}=\left( \frac{IA}{hc/\lambda } \right)\left( 1+r \right)\frac{h}{\lambda }\] \[\Rightarrow P=\frac{F}{A}=\frac{I}{c}\left( 1+r \right)\]


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