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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//4`

C

`4//7`

D

`5//8`

Text Solution

Verified by Experts

The correct Answer is:
B
`I = "ne"Av_(d) rArr (v_(d))_(e)/(v_(d))_(h) = i_(e)/i_(h) xx n_(h)/n_(e) = 7/4 xx 5/7 = 5/4`
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