Question

The wave nature of electron was experimentally verified by diffraction of electron by Nickel crystal.

1. Name the experiment which establish wave nature of moving electron.

2. An electron and a proton have same kinetic energy which of these particles has shortest de Broglie wave length?

Answer 1

1. Davisson and Gemner experiment 

2. λ = \(\frac{h}{p}\)

K = \(\frac{p^2}{2m}\)

P = \(\sqrt{2mk}\)

λ = \(\frac{h}{\sqrt{2mk}}\)

λα \(\frac{h}{\sqrt{m}}\)

Mass of alpha particle is more than that of proton, hence it has shortest wavelength.