Q. If the kinetic energy of an electron is increased four times, the wavelength of the de-Broglie wave associated with it would becomes
A) Half times
B) $\frac{1}{4}$ times
C) Four times
D) Two times
Explanation
(a)
$\lambda = \frac{h}{\sqrt{2Em}}$
When kinetic energy of electron becomes four times, the de-Broglie wavelength will become half
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.