Question

Mobilities of electrons and holes in a sample of intrinsie 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 $3.6 \times 10^{19}m^{- 3}$ the germanium conductivity is.

• A. $4.14Sm^{- 1}$
• B. $2.12Sm^{- 1}$
• C. $1.13Sm^{- 1}$
• D. $5.6Sm^{- 1}$

Answer 1

Answer: (A)

$4.14Sm^{- 1}$

Answer 2

: As $\sigma = e(n_{e}\mu_{e} + n_{n}\mu_{n})$

$= en_{i}(\mu_{e} + \mu_{n})$

}{= 4.147Sm^{- 1}}$$