The correct representation of γ emission is :

1. $_{Z}^{A}\text{P} \longrightarrow \space _{Z-1}^{ \space \space \space \space \space A}\text{Q} + γ$
2. $_{Z}^{A}\text{P} \longrightarrow \space _{Z-2}^{A-4}\text{Q} + \space _{2}^{4}γ$
3. $_{Z}^{A}\text{P} \longrightarrow \space _{Z}^{A}\text{P} + γ$
4. $_{Z}^{A}\text{P} \longrightarrow \space _{Z-1}^{A}\text{P} + γ$

The number of beta particles emitted by a radioactive substance is twice the number of alpha particles emitted by it. The resulting daughter nucleus is :

1. isotope of the parent
2. isobar of the parent
3. isotone of the parent
4. None of the above

Assertion (A): Out of α, β and γ radiation, α-particles have maximum penetrating power.

Reason (R): The α-particles are the heaviest amongst the three.

1. Both A and R are true and R is the correct explanation of A.
2. Both A and R are true and R is not the correct explanation of A.
3. assertion is false but reason is true.
4. assertion is true but reason is false.

Assertion (A): ¹⁴₆C and ¹⁴₇N are isobars.

Reason (R): ¹⁴₆C has 6 protons and 8 neutrons in its nucleus, whereas ¹⁴₇N has 7 protons and 7 neutrons in its nucleus.

1. Both A and R are true and R is the correct explanation of A.
2. Both A and R are true and R is not the correct explanation of A.
3. assertion is false but reason is true.
4. assertion is true but reason is false.