Question: Q. 2. Write briefly the underlying principle used in Davisson-Germer experiment to verify wave nature of electrons experimentally. What is the de-Broglie wavelength of an electron with kinetic energy (K.E.) 120eV ?

U] [OD South 2016]

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Solution:

Ans. Diffraction effects are observed for beams of electrons scattered by the crystals.

λ=1.227 nmV λ=1.227 nm120 λ=0.112 nm

Alternatively,

λ=h2meV λ=6.63×10342×9.1×1031×1.6×1019×120 λ=0.112 nm



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