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Mobilities of electorns and holes in a s...

Mobilities of electorns and holes in a sample of intrinsic germanium at room temperature are `0.54m^(2)V^(-1)s^(-1)` and `0.18m^(2)V^(-1)s^(-1)` respectively.
If the electron and hole densities are equal to `3.6xx10^(19)m^(-3)` calculate the germanium conductivity.

A

4.147`sm^(-1)`

B

0.54`sm^(-1)`

C

2.24`sm^(-1)`

D

3.92 `sm^(-1)`

Text Solution

Verified by Experts

The correct Answer is:
A
`sigma=e(n_(e)u_(e)+n_(n)mu_(n))=en_(i)(mu_(e)+mu_(n))`
`=1.6xx10^(-19)xx3.6xx10^(19)`
`=(0.54+0.18)=4.147sm^(-1)`
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