Show on a graph, the variation of resistivity with temperature for a typical semiconductor.

Question

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Answer 1

The resistivity is given by:
$ρ = \frac{m}{n e ^{2} τ}$
where n = number density of electrons

$ρ$ = relaxation time
With the rise in temperature, number density of electrons and holes (in case of semiconductors) increases, where $τ$ remains constant. So, $ρ$ (resistivity) decreases.

Answer 2

The resistivity is given by:

ρ = \frac{m}{n e ^{2} τ}

where n = number density of electrons

ρ

= relaxation time

With the rise in temperature, number density of electrons and holes (in case of semiconductors) increases, where

τ

remains constant. So,

ρ

(resistivity) decreases.