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If ratio of concentration of electrons t...

If ratio of concentration of electrons to that of holes in a semiconductor is 7/5 and the ratio of currents is 7/4 , 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_hxxn_h/n_e=7/4xx5/7=5/4`
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