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Q.

If the ratio of the concentration of electrons to that of holes in a semi-conductors is 75 and the ratio of currents is 74, then the ratio of drift velocities is

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a

5/8

b

4/5

c

5/4

d

4/7

answer is C.

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Detailed Solution

I=neAVdleIh=ne×vdenh×vdhHere nenh=75,leIh=74∴74=75×vdevdh⇒vdevdh=57×74=54
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