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.



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