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_e/I_h = (n_evAv_e)/(n_h eAv_h) rArr 7/4 = 7/5 xx v_e/v_h`
`rArr v_e/v_h = 5/4`

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