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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

`(4)/(7)`

B

`(5)/(8)`

C

`(4)/(5)`

D

`(5)/(4)`

Text Solution

Verified by Experts

The correct Answer is:
D
`v_(d)=(1)/("ne"A)`
`(v_(e))/(v_(h))=(I_(e))/(I_(h))xx(n_(h))/(n_(e))=(7)/(5)xx(5)/(7)=(5)/(7)`
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