NEET Sample Paper NEET Sample Test Paper-9

  • question_answer If the ratio of the concentration of electrons and holes in a semiconductor is 7/5 and the ratio of currents is 7/4, then what is the ratio of their driff velocities:

    A)  \[\frac{7}{4}\]                       

    B)  \[\frac{5}{8}\]

    C)  \[\frac{4}{5}\]                       

    D)  \[\frac{5}{4}\]

    Correct Answer: D

    Solution :

    Given that   \[\frac{{{n}_{e}}}{{{n}_{h}}}=\frac{7}{5}\] and \[\frac{{{l}_{e}}}{{{l}_{h}}}=\frac{7}{4}\] \[\frac{{{({{V}_{d}})}_{e}}}{{{({{V}_{d}})}_{h}}}=\frac{{{l}_{e}}}{{{l}_{h}}}\times \frac{{{n}_{h}}}{{{n}_{e}}}=\frac{5}{4}\]

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