Question
(a) Beta decay is nuclear decay in which an electron is emitted. If the electron is given 0.750 MeV of kinetic energy, what is its velocity? (b) Comment on how the high velocity is consistent with the kinetic energy as it compares to the rest mass energy of the electron.
1. $0.914c$
2. Since the mass of the electron is so small ($0.511 \textrm{ MeV}$), the velocity needs to be compensatingly very high.
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