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

  • question_answer
    In germanium the energy gap is about\[0.75\text{ }eV\]. The wavelength of light which germanium starts absorbing is

    A)  \[5000\text{ }\overset{o}{\mathop{A}}\,\]

    B)                     \[1650\text{ }\overset{o}{\mathop{A}}\,\]

    C)  \[16500\text{ }\overset{o}{\mathop{A}}\,\]

    D)         \[165000\text{ }\overset{o}{\mathop{A}}\,\]

    Correct Answer: C

    Solution :

    [c] \[\lambda =\frac{hc}{E}=\frac{6.63\times {{10}^{-34}}\times 3\times {{10}^{8}}}{0.75\times 1.6\times {{10}^{-19}}}=16500\overset{o}{\mathop{A}}\,\]


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