If a proton and an electron have the same speed, which one has the longer de Broglie wavelength?
A) the electron
B) the proton
C) It is the same for both of them.

Question

Quizplus · Accepted Answer

The de Broglie wavelength is inversely proportional to the momentum of a particle. Given the same speed, the electron, having a much smaller mass than the proton, will have a smaller momentum, resulting in a longer de Broglie wavelength.

If a Proton and an Electron Have the Same Speed