Beta particles are stream of fast moving electrons, while the term amu means
atomic mass unit, beta particle has only mass of electron,
therefore mass of electron in amu
is about 0.000548597 a.m.u. An electron is about 1/1840 time less
dense than a proton, if the mass of proton is given about 1.007277
amu , then an electron mass will be given as 0.000548597
amu.
therefore since a beta
particle is composed of electron , it mass should equal to mass of electrons.
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