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A parallel beam of fast moving electron ...

A parallel beam of fast moving electron is incident normally on a narrow slit . A fluorescent screen is placed at a large distance from the slit . If the speed of the electrons is correct?

A

Diffraction pattern is not observed on the screen in the case of electrons

B

The angular width of the central maximum of the diffraction pattern will increase

C

The angular width of the central maximum will decrease

D

The angular width of the central maximum will be unaffected

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