Question

What will be conductivity of pure silicon crystal at $300 K$ temperature. If electron hole pairs per $cm ^{3}$ is $1.072 \times 10^{10}$ at this temperature, $\mu_{ n }=1350 cm ^{2} / volt - s$ and $\mu_{ P }=480$ $cm ^{2} /$ volt-s

• A. $3.14 \times 10^{-6} mho / cm$
• B. $3 \times 10^{6} mho / cm$
• C. $10^{-6} mho / cm$
• D. $10^{6} mho / cm$

Answer 1

Answer: (A)

$\sigma=en \left(\mu_{ e }+\mu_{ n }\right)$
$=1.6 \times 10^{-19} \times 1.072 \times 10^{10} \times(1350+480)$
$=3.14 \times 10^{-6} \mho / cm$