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

  • question_answer
    According to photon theory of light which of the following physical quantities associated with a photon do not/does not change as it collides with an electron in vacuum [AMU (Engg.) 2001]

    A)            Energy and momentum  

    B)            Speed and momentum

    C)            Speed only                           

    D)            Energy only

    Correct Answer: C

    Solution :

               Speed of photon is \[3\times {{10}^{8}}m/s\] in vacuum.


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