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) As velocity (or momentum) of electron is increased, the wavelength $\left( \lambda = \frac{h}{p} \right)$ will decrease. Hence, fringe width will decrease $(\omega \propto \lambda)$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.