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

  • question_answer
    When yellow light is incident on a surface, no electrons are emitted while green light can emit. If red light is incident on the surface, then       [MNR 1998; MP PET 2000; MH CET 2000]

    A)            No electrons are emitted

    B)            Photons are emitted

    C)            Electrons of higher energy are emitted

    D)            Electrons of lower energy are emitted

    Correct Answer: A

    Solution :

               \[{{\lambda }_{r}}>{{\lambda }_{y}}>{{\lambda }_{g}}\]. Here threshold wavelength \[<{{\lambda }_{y}}\].


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