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

  • question_answer
    The work function of a substance is 4.0 eV. The longest wavelength of light that can cause photoelectron emission from this substance is approximately [IIT JEE 1998; UPSEAT 2002, 03; AIEEE 2004]

    A)            540 nm                                   

    B)            400 nm

    C)            310 nm                                   

    D)            220 nm

    Correct Answer: C

    Solution :

               \[{{\lambda }_{0}}=\frac{hc}{{{W}_{0}}}=\frac{12400}{4}=3100{\AA}=310\ nm\]


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