A proton and an electron have the same de Broglie wavelength.
A) The electron has the higher speed.
B) The proton has the higher speed.
C) They have the same speed.
D) Any of the choices is true, depending on the wavelength.

Question

Quizplus · Accepted Answer

Since the de Broglie wavelength of a particle is inversely proportional to its momentum, we can conclude that the electron has a higher momentum than the proton since they have the same de Broglie wavelength. Since momentum is directly proportional to velocity, the electron must have a higher speed than the proton.

A Proton and an Electron Have the Same De Broglie