Q. An electron is accelerated through a potential difference of $V$ volt. The speed of electrons will be
A) $\sqrt{\frac{eV}{m}}$
B) $\sqrt{\frac{2eV}{m}}$
C) $\sqrt{\frac{eV}{2m}}$
D) $\sqrt{\frac{m}{2eV}}$
Explanation
(b) If $v$ is the velocity attained by electron, then
$\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \frac{1}{2}mv^{2} = eV$
$v = \ \sqrt{\frac{2eV}{m}}$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.