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

The angular width of the central maximum will decrease.

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The angular width of the central maximum will be unaffected.

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Difraction pattern is not observed on the screen in the case of electrons.

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

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Solution

The correct option is A The angular width of the central maximum will decrease.
The angular width of the central maximum will decrease because as velocity increases, the wavelength will decrease.

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