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