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JEE Main & Advanced Physics Photo Electric Effect, X- Rays & Matter Waves Question Bank Photon and Photoelectric Effect

  • question_answer
    The momentum of a photon in an X-ray beam of \[{{10}^{-10}}\]metre wavelength is                                    [MP PET 1996]

    A)            \[1.5\times {{10}^{-23}}kg-\]m/sec                                

    B)            \[6.6\times {{10}^{-24}}kg-m/\sec \] m/sec

    C)            \[6.6\times {{10}^{-44}}kg-m/\sec \]m/sec                

    D)            \[2.2\times {{10}^{-52}}kg-m/\sec \] m/sec

    Correct Answer: B

    Solution :

                       Momentum of photon                    \[p=\frac{h}{\lambda }=\frac{6.6\times {{10}^{-34}}}{{{10}^{-10}}}\]= 6.6 ´ 10?24 kg - m/sec.


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