Question

The mass of electron is $M$, its charge is $e$ and it is accelerated from rest through a potential $V$. The kinetic energy of the electron will be:

• A. V
• B. eV
• C. MeV
• D. none of the above.

Answer 1

Answer: (B)

eV

Answer 2

Here $eV = \frac{1}{2} M v^2$ And $v = [ 2 e V / M]^{1/2}$ . Energy in joule is eV .