Write briefly the underlying principle used in Davison-Germer experiment to verify wave nature of electrons experimentally. What is the de-Broglie wavelength of an electron with kinetic energy (K.E.) 120 eV?
The Davisson-Germer experiment proved the De Broglie’s hypothesis which relates wavelength of a particle to its energy.
Davisson-Germer used the phenomena of diffraction to study the eave nature of electrons. When a wave is incident on a Nickel crystal, they are reflected form different layers of the ordered crystal lattice and hence have a fixed phase difference. After reflection, these waves interfere either constructively or destructively giving rise to a diffraction pattern of light and dark fringes. As this pattern was observed with electrons bombarded on Ni lattice, their dual nature was verified.
From de Broglie’s hypothesis,
—————(1)
Here,
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