Assertion `(A) :` Nucleus of the atom does not contain electrons, yet it emits `beta-`particles in the form of electrons.
Reason `(R):` In the nucleus , protons and neutrons exchange mesons frequently.

Options

A. If both `(A)` and `(R)` are correct , and `(R)` is the correct explanation of `(A)`
B. If both `(A)` and `(R)` are correct, but (R) is not the correct explanation of `(A)`
C. If `(A)` is correct, but `(R)` is incorrect.
D. If `(A)` is incorrect, but `(R)` is correct.

Answer

C

Explanation

`beta-` particle is emitted not due to exchange of meson between neutron and proton but due to conversion of a neutron into proton as follows `:`
`._(0)n^(1)rarr+._(+1)p^(1)+._(-1)e^(0)`