A radioactive nucleus emits a beta particle. The position of daughter nucleus in the periodic table as compared to the parent nucleus after emitting a beta particle is :

1. at the same place
2. one place higher
3. one place lower
4. two places lower

The speed of γ radiations is :

1. of the order of 10⁶ ms^-1
2. of the order of 10⁷ ms^-1
3. equal to the speed of light, i.e. 3 x 10⁸ ms^-1
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.