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Q.

The mobility of free electrons (charge e, mass m and relaxation time $π$ ) in a metal is proportional to

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a

$\frac{e}{mτ}$

b

$\frac{m}{eτ}$

c

$\frac{m}{e} τ$

d

$\frac{e}{m} τ$

answer is A.

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Detailed Solution

We know mobility of free electrons is given as

$μ = \frac{q τ}{m}$

here q = e.

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The mobility of free electrons (charge e, mass m and relaxation time π) in a metal is proportional to