[" The de-Broglie wavelength of a proton "],[" and an electron are equal.Then it "],[" follows that "]

The de-Broglie wavelength of a proton and an electron are equal. The it follows that

The de Broglie wavelength of a proton and an electron are same, then what is the relation between their kinetic energies?

If the de - Broglie wavelengths for a proton and for an alpha - particle is equal , then what is the ratio of velocities for proton and alpha particle?

The de Broglie wavelength of electron in second Bohr orbit is exactly equal to