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Q.

The ratio of electron and hole currents in a semiconductor is 5/4 and the ratio of drift velocities of electron and holes is 7/4, then the ratio of concentrations of electrons and holes will be

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a

5/7

b

25/49

c

7/5

d

49/25

answer is A.

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Detailed Solution

we know that I=neAv  or  I∝nvIeIh=nenh×VeVh  or 54=nenh×74  or nenh=54×47=57
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