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Mobility of electron and holes in a sample of intristic germanium at room temperature are `0.36m^(2)V^(-1)s^(-1) and 0.17 m^(2)V^(-1)s^(-1)`. The electron and hole densities are each equal to `2.5xx10^(19) m^(-3)`. The electrical conductivity of germanium is

A

`0.47Sm^(-1)`

B

`1.09 Sm^(-1)`

C

`2.12Sm^(-1)`

D

`4.24 Sm^(-1)`

Text Solution

Verified by Experts

The correct Answer is:
C
`sigma=1/rho=e(mu_(e)n_(e)+mu_(h)n_(h))`
`=1.6xx10^(-19)[0.36+0.17]xx(2.5xx10^(19))`
`=2.12Sm^(-1)`
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PRADEEP-ELECTRONIC DEVICES-Exercise
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