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If the ratio of the concentration of ele...

If the ratio of the concentration of electron to that of holes in a semiconductor is `(7)/(5)` and the ratio of current is `(7)/(4)` then what is the ratio of their drift velocities ?

A

`(5)/(8)`

B

`(4)/(5)`

C

`(5)/(4)`

D

`(4)/(7)`

Text Solution

Verified by Experts

The correct Answer is:
C
`I=n eAv_(d)rArrv_(d)prop(1)/(n)`
`(v_(d_(1)))/(v_(d_(2)))=(I_(1))/(I_(2))xx(n_(2))/(n_(1))=(7)/(4)xx(5)/(7)=(5)/(4)`
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