The mass of an electron is m, charge is e and it is accelerated form rest through a potential difference of V volts. The velocity acquired by electron will be :

Options

A. `(eV)/(2m)`
B. `(eV)/(m)`
C. `sqrt((2eV)/(m))`
D. `sqrt((eV)/(m))`

Answer

C

Explanation

`because` K.E of electron `=(1)/(2) mv^(2)= eV`
`rArr V^(2)= (2eV)/(m)`
`rArr v= sqrt((2eV)/(m))`