NEET | 2013Wave OpticsEasy
Question
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 ?
Options
A.The angular width of central maximum will be unaffacted.
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.
Solution
As speed of electrons is increased so wavelength of electrons will decreases. Therefore the angular width (∝ λ) of the central maximum of diffrection pattern will decrease.
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