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A Beta decay is a type of radioactive decay in which a beta particle (an electron or a positron) is emitted from an atomic nucleus. During a negative beta decay $\beta^{-}$, which of the following happens?

$(a)\;an\;atomic\;electron\;is\;ejected\qquad(b)\;an\;electron\;which\;is\;already\;present\;within\;nucleus\;inejected\qquad(c)\;a\; neutron\;in\;nucleus\;decays\;emitting\;an\;electron \qquad(d)\;None$

Answer : (c) a neutron in nucleus decays emitting an electron
Beta decay is mediated by the weak force. There are two types: beta minus and beta plus. In the case of beta decay that produces an electron emission, it is referred to as beta minus (β−), while in the case of a positron emission as beta plus (β+).
An example of β− decay is shown when carbon-14 decays into nitrogen-14: $^{14}_ {6} C \rightarrow ^{14}_ {7} N + e^{−} + \overrightarrow {ν_e}$
edited Apr 2, 2014