Question

A nonrelativistic electron and a nonrelativistic proton have the same de broglei wavelength will their frequency be same

Answer 1

Two particles with the same de Broglie wavelength will have the same momentum p = mv. If the electron and proton have the same momentum, they cannot have the same speed because of the difference in their masses. For the same reason, remembering that KE = p2/2m, they cannot have the same kinetic energy.