AN ELECTRON AND ALPHA PARTICLE HAVE THE SAME de-Broglie WAVE LENGTH ASSOCIATED WITH THEM .HOW ARE THEIR KINETIC ENERGIES RELATED ?

since debroglie's wavelength of electron = debroglie wavelength of alpha particle

momentum of electron= momentum of alpha particle.(because, lambda= planck's const/ momentum)

KE = (momentum)^{2}/ mass and mass of alpha particle being 4 times mass of an electron, the ratio of KE comes out to be 4:1

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