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If the ratio of the concentration of electrons to that of holes in a semiconductor is 7/5

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If the ratio of the concentration of electrons to 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?

(a) 5/8

(b) 4/5

(c) 5/4

(d) 4/7

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Correct Option (b) 4/5

Explanation:

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