Radioactive nuclei emit `beta^-1` particles.
Electrons exist inside the nucleus.

Options

A. If the 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

C

Explanation

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 radioative transformation. So electrons do not exist in the nucleus but they result in some nuclear trasformation.