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NEET Sample Paper NEET Sample Test Paper-17

  • question_answer
    The electrical conductivity of a semiconductor increases when em radiation of wavelength shorter than 2480 nm is incident on it. The band gap (in eV) the semiconductor is:

    A)   0.9                            

    B)  0.7                             

    C)  0.5                   

    D)    0.1

    Correct Answer: C

    Solution :

    Energy of the radiation\[=E=\frac{hc}{\lambda }\] Inserting the values we get \[E=\frac{1242\,e\forall -nm}{2480\,nm}=0.5\,e\forall \] Hence, the correction option is [c].


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