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JEE Main & Advanced Physics Semiconducting Devices Question Bank Self Evaluation Test - Semiconductor Electronics: Materials, Devices and Simple Circuits

  • question_answer
    The electric conductivity of an intrinsic semiconductor   increases   when   the electromagnetic waves of wavelength equal or shorter than \[3895\text{ }nm\] is incident on it. The band gap of the semiconductor is

    A)  \[0.2\text{ }eV\]

    B)  \[0.3\text{ }eV\]

    C)  \[1.0\text{ }eV\]

    D)  \[1.5\,eV\]

    Correct Answer: B

    Solution :

    [b] Forbidden energy gap \[=\frac{12400\,(eV-\overset{o}{\mathop{A}}\,)}{\lambda (\overset{o}{\mathop{A}}\,)}\] \[=\frac{12400}{38950}eV=0.3\,eV.\]


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