Question

mass of alpha particle compared to proton

Answer 1

Alpha particle consists of two neutrons and two protons, and is thus identical to the nucleus of a helium atom. The rest mass of the alpha particle amounts to 4 a.m.u which equals to about 6.644×10^-27 kg and its charge is +2e i.e twice of a proton.

Answer 2

mass of alpha particle is four times that of proton.