An electron and a proton are moving with the same kinetic energy in vacuum. Which statement about their de Broglie wavelengths is correct?
a) The electron has a smaller de Broglie wavelength than the proton.
b) Both particles have the same de Broglie wavelength.
c) The proton has a smaller de Broglie wavelength than the electron.
d) The de Broglie wavelengths cannot be predicted without knowing their velocities.