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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="ne"AV_(d)`
`(I_(e))/(I_(b))=(n_(e)xx(v_(d))_(e))/(n_(b)xx(v_(d))_(b))`
Here `(n_(e))/(n_(h))=(7)/(5),(I_(e))/(I_(h))=(7)/(4)`
`:.(7)/(4)=(7)/(5)xx((v_(d))_(e))/((v_(d))_(h))`
`implies((v_(d))_(e))/((v_(d))_(h))=(5)/(7)xx(7)/(4)=(5)/(4)`
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