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Q.

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

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a

The angular width of central maximum will decrease

b

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

c

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

d

The angular width of central maximum will be unaffected

answer is C.

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Detailed Solution

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As speed increases its de Broglie wave length deceases, hence angular fringe width decreases.

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