Questions in nuclei

Select	Question
	A radioactive material has a half-life of 8 years. The activity of the material will decrease to about 1/8 of its original value in
	A nucleus decays by ${\beta ^ + }$ emission followed by a gamma emission. If the atomic and mass numbers of the parent nucleus are Z and A respectively, the corresponding numbers for the daughter nucleus are respectively.
	$_{90}^{232}Th$ an isotope of thorium decays in ten stages emitting six $\alpha$ -particles and four $\beta$ -particles in all. The end product of the decay is
	The composition of an $\alpha$ -particle can be expressed as
	A nucleus of mass 218 amu in free state decays to emit an $\alpha$ -particle. Kinetic energy of the $\alpha$ -particle emitted is 6.7 MeV. The recoil energy (in MeV) of the daughter nucleus is
	The particle that possesses half integral spin as
	Nuclear fusion is common to the pair
	${C^{14}}$ has half life 5700 years. At the end of 11400 years, the actual amount left is
	Mean life of a radioactive sample is 100 seconds. Then its half life (in minutes) is
	$_{86}{A^{222}}{ \to _{84}}{B^{210}}$. In this reaction how many $\gamma$ and $\gamma$ particles are emitted