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

  • question_answer
    If the ratio of the concentration of electrons to that of holes in a semiconductor is \[\frac{7}{5}\] and the ratio of currents is \[\frac{7}{4},\] then what is the ratio of their drift velocities?

    A)  \[\frac{5}{8}\]

    B)  \[\frac{4}{5}\]    

    C)  \[\frac{5}{4}\] 

    D)  \[\frac{4}{7}\]

    Correct Answer: C

    Solution :

    [c]  \[\frac{{{I}_{e}}}{{{I}_{h}}}=\frac{{{n}_{e}}eA{{v}_{e}}}{{{n}_{h}}eA{{v}_{h}}}\Rightarrow \frac{7}{4}=\frac{7}{5}\times \frac{{{v}_{e}}}{{{v}_{h}}}\Rightarrow \frac{{{v}_{e}}}{{{v}_{h}}}=\frac{5}{4}\]


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