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Semiconductor Electronics: Materials, Devices And Simple Circuits

Question

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If the ratio of the concentration of electrons that of holes in a semiconductor is 7 /5 and the ratio of currents is 7/4, then what is the ratio of their drift velocities?

4/7

5/8

4/5

5/4

Solution

D.

5/4

straight n subscript straight e over straight n subscript straight n space equals space 7 over 5 straight I subscript straight e over straight I subscript straight n space equals space 7 over 4 fraction numerator left parenthesis straight V subscript straight d right parenthesis subscript straight e over denominator left parenthesis straight V subscript straight d right parenthesis subscript straight n end fraction space rightwards double arrow space straight I subscript straight e over straight I subscript straight n space straight x straight n subscript straight n over straight n subscript straight e space equals 5 over 4

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