Question

# The mobility of free electrons (charge =e, mass = m and-relaxation time $$\tau$$) in a metal is proportional to :

A
emτ
B
meτ
C
emτ
D
meτ

Solution

## The correct option is D $$\dfrac{e}{m}\tau$$Drift velocity per unit electric field is called mobility of electron, i.e., $$\mu =\dfrac{V_d}{E}=\dfrac{E}{\rho neE}$$Now, $$\rho =\dfrac{m}{ne^2\tau }$$$$\therefore \mu =\dfrac{ne^2\tau }{mne}=\dfrac{e\tau }{m}$$Physics

Suggest Corrections

0

Similar questions
View More

People also searched for
View More