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Q.

A beam of electron is used in an YDSE experiment. The slit width is d. When the velocity of electron is increased, then

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a

No interference is observed 

b

Fringe width decreases 

c

Fringe width increases

d

Fringe width remains same

answer is C.

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Detailed Solution

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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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