Q. A beam of electron is used in an $YDSE$ experiment. The slit width is d. When the velocity of electron is increased, then
A) No interference is observed
B) Fringe width increases
C) Fringe width decreases
D) Fringe width remains same
Explanation
(c) Momentum of the electron will increase. So the wavelength $(\lambda = h/p)$ of electrons will decrease and fringe width decreases as $\beta \propto \lambda$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.