Question

Calculate the de Broglie wavelength of a proton whose kinetic energy is equal to 81.9 x 10^-15 J. (Given: mass of proton is 1836 times that of electron).

Answer 1

m = 1.67 x 10^-27 kg 

K.E = 81.9 x 10^-15 J

de-Broglie wavelength of proton, λ = \(\frac{h}{\sqrt{2mK}}\)

λ = 4 x 10^-14 m