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CET Karnataka Medical CET - Karnataka Medical Solved Paper-2012

  • question_answer
    n photons of wavelength \[\lambda \] are absorbed by a black body of mass m. The momentum gained by the body is

    A)  \[\frac{h}{m\lambda }\]

    B)  \[\frac{mnh}{\lambda }\]

    C)  \[\frac{nh}{m\lambda }\]

    D)  \[\frac{nh}{\lambda }\]

    Correct Answer: D

    Solution :

    : Energy of n photons, \[E=\frac{nhc}{\lambda }\] Momentum gained by the body, \[p=\frac{E}{c}\] \[=\frac{nhc}{\lambda c}=\frac{nh}{\lambda }\]


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