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 :

A

B

C

D

## V

Hard
Solution
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Correct option is B)

## 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,= m

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