question_answer

In the following questions, Statement of assertion (A) is followed by a statement of reason (R).       1. If both assertion and reason are true and the reason is the correct explanation of the assertion, then mark. 2. If both assertion and reason are true but the reason is not the correct explanation of the assertion, then mark. 3. If assertion is true statement but reason is false, then mark. 4. If both assertion and reason are false statements then mark.

Assertion: Radioactive nuclei emit \[{{2}^{1/3}}:1\]particles, Reason: Electrons exist inside the nucleus.

A)  1       

B)                        2                            

C)  3                                            

D)  4

Correct Answer: C

Solution :

Radioactivity is a nuclear phenomenon that is the radioactive rays are emitted from the nucleus of the atom. Atomic nucleus consists of protons and neutrons in the centre of the atom that carries the bulk of the atoms mass and positive charge. While electrons revolve around the nucleus, in certain discrete orbits.