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A beam of monoenergetic electrons, which...

A beam of monoenergetic electrons, which have been accelerated from rest by a potential U, is used to form an interference pattern in a Young's Double slit experiment. The electrons are now accelerated by potential 4U. The fringe width -

A

increae

B

decrease

C

remains same

D

no fringe pattern will be fromed

Text Solution

Verified by Experts

The correct Answer is:
B
On increasing speed of electron, de Broglie wavelength associated with it will decrease `(lambda=(h)/(mv)).` Since fringe width `beta=(Dlambda)/(d),` it will decrease.
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Knowledge Check

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    `1`
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