Calculate the de Broglie wavelength of (i) an electron (in the hydrogen atom) moving with a speed of 1 100 of the speed of light in vacuum and (ii) a ball of radius 5 mm and mass 3 × 10–2 kg moving with a speed of 100 ms–1. Hence show that the wave nature of matter is important at the atomic level but is not really relevant at the macroscopic level. Share with your friends Share 5 Shobhit Mittal answered this Dear Student, (i) λ=hmv de brogile eqn.λ=6.32*10-349.1*10-31×3*106=0.23*10-9=2.3 angstromii we are going to find the wavelength for the ball and compare with radius of ball.λ=6.32*10-343*10-2×100=2.11*10-34 mm so its a very small value in compare to the radius of 0.005 m so thats why de brogile wavelegth has no significance for the macroscopic level .Regards 1 View Full Answer