If the mass of an electron is m, then the mass of a β-particle is:
(a) m
(b) 2m
(c) 3m
(d) 4m
Atomic Nucleus
01 Mark
(a) m
Explanation
A β-particle (β⁻) is a high-speed electron emitted from the nucleus during beta decay.
Therefore, the mass of a β-particle is equal to the mass of an electron.
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