Question

Wave property of electrons implies that they will show diffraction effects. Davisson and Germer demonstrated this by diffracting electrons from crystals. The law governing the diffraction from a crystal is obtained by requiring that electron waves reflected from the planes of atoms in a crystal interfere constructively (see figure).
Electrons accelerated by potential V are diffracted from a crystal. If and , V should be about :

expand
A

V

B

V

C

V

D

V

Hard

Solution

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Correct option is
B

V

We have, 

angle of incidence =
Given , , , and
Also for order diffraction.
Therefore,


We have de-Broglie wavelength,
and also
Substituting in de-Broglie wavength, we get,
=

Solve any question of Dual Nature of Radiation And Matter with:-

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