Optics Question 193
Question: A beam of electron is used in an YDSE experiment. The slit width is d. When the velocity of electron is increased, then
[IIT-JEE (Screening) 2005]
Options:
A) No interference is observed
B) Fringe width increases
C) Fringe width decreases
D) Fringe width remains same
Show Answer
Answer:
Correct Answer: B
Solution:
Momentum of the electron will increase. So the wavelength (l = h/p) of electrons will decrease and fringe width decreases as b µ l.
