Question

Assertion: Radioactive nuclei emit ${\beta }^{-}$ particles.
Reason: Electrons exist inside the nucleus.

• A. if both assertion and reason are true and the reason is the correct explanation of the assertion
• B. if both assertion and reason are true and the reason is not the correct explanation of the assertion
• C. if assertion is true but reason is false
• D. if both assertion and reason are false statements

Answer 1

Answer: (C)

Nuclear stability depends upon the ratio of neutron to proton. If the $n/p$ ratio is more than the critical value, then a neutron gets converted into a proton forming a ${\beta }^{-}$ particle in the process.
$n\to p+e^{-}$
The ${\beta }^{-}$ particle $(e^{-}$ ) is emitted from the nucleus in some radioactive transformation. So electrons do not exist in the nucleus but they result in some nuclear transformation.