If a proton were traveling the same speed as electrons in a TV picture tube (about 7.2 107 m/s), what would its de Broglie wavelength be? The mass of a proton is 1.67 10-27 kg.

Question

If a proton were traveling the same speed as electrons in a TV picture tube (about 7.2  107 m/s), what would its de Broglie wavelength be? The mass of a proton is 1.67  10-27 kg.

herp_derp · Answer

The De Broglie wavelength can be calculated by... λ = h/p or λ = h/mv So, plug the numbers in and... λ = (6.63 x 10^-34 J*s) / [(1.67 x 10^-27 kg)(7.2 x 10^7 m/s)] λ = 5.5 x 10^-15 m