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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 electrons is increased, which of the following statements is correct?
A
The angular width of central maximum will be unaffected.
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 the central maximum will decrease.
Detailed Solution
As the speed of the electrons increases, their de Broglie wavelength decreases.
The angular width of the central maximum ($\propto \lambda$) therefore decreases.
The angular width of the central maximum ($\propto \lambda$) therefore decreases.