Question

$\beta$-decay means emission of electron from

• A. A stable nucleus
• B. Outermost electron orbit
• C. Radioactive nucleus
• D. Innermost electron orbit

Answer 1

Answer: (C)

$\beta$-emission takes place from a radioactive nucleus as
${}_{15}^{32}p\stackrel{-\beta }{\to }{}_{16}^{32}S+{}_{-1}{e}^0+\overline{v}$
where $\bar{v}$ is the anti-neutrino.
$\ln {\beta }^{+}$ decay a positron is emitted as
${}_{11}^{22}Na\to {}_{10}^{22}Ne+{}_{+1}{e}^0+v$
where $v$ is the neutrino.