JEE Main & Advanced Sample Paper JEE Main Sample Paper-21

  • question_answer
    The work function of a substance is 4.0 eV The longest wavelength of light that can use photo electron emission from this substance is approximately:

    A)  540 nm                       

    B)  400nm

    C)  310nm                        

    D)  220nm

    Correct Answer: C

    Solution :

    \[{{\lambda }_{0}}\,=\frac{2m{{\lambda }^{2}}c}{h}\,\]= 310 nm


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