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

  • question_answer
    The electrical conductivity of a semi-conductor increases when radiation of wavelength shorter than 2480 mn is incident on it. The band gap (in eV) for semiconductor is:

    A)  0.9                              

    B)  0.7

    C)  0.5                              

    D)  1.1

    Correct Answer: C

    Solution :

    \[E(eV)\,=\frac{12375}{\lambda (in\ \overset{\text{o}}{\mathop{\text{A}}}\,)}\] \[=\frac{12375}{24800}(in\,eV)\,=0.5\,eV\]


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