JEE Main & Advanced Physics Photo Electric Effect, X- Rays & Matter Waves Question Bank Topic Test - Photo Electric Effect, X-Rays & Matter Waves

  • question_answer
    A photon of wavelength 4400 \[\overset{\text{o}}{\mathop{\text{A}}}\,\] is passing through vacuum. The effective mass and momentum of the photon are respectively 

    A) \[5\times {{10}^{-36}}kg,\,\,1.5\times {{10}^{-27}}\,kg\text{-}m/s\]

    B) \[5\times {{10}^{-35}}kg,\,\,1.5\times {{10}^{-26}}kg\text{-}m/s\]

    C) Zero, \[1.5\times {{10}^{-26}}\,kg\text{-}m/s\]

    D) \[5\times {{10}^{-36}}kg,\,1.67\times {{10}^{-43}}kg\text{-}m/s\]

    Correct Answer: A

    Solution :

    [a] \[p=\frac{h}{\lambda }=\frac{6.6\times {{10}^{-34}}}{4400\times {{10}^{-10}}}=1.5\times {{10}^{-27}}kg.m/s\] and mass \[m=\frac{p}{c}=\frac{1.5\times {{10}^{-27}}}{3\times {{10}^{8}}}=5\times {{10}^{-36}}kg\]

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