A nuclear reaction is given by
${}_Z{X^A} \to {}_{Z + 1}{Y^A} + {}_{ - 1}{e^0} + \bar v$ , represents
fission
$\beta - $ decay
$\sigma - $ decay
fusion
An atomic nucleus $_{90}T{h^{232}}$ emits several $\alpha$ and $\beta$ radiations and finally reduces to $_{82}P{b^{208}}$. It must have emitted
In pair annihilation, an electron and a positron destroy each other to produce gamma radiation. How is the momentum conserved ?
In gamma ray emission from a nucleus
The composition of an $\alpha $- particle can be expressed as
Which of the following will have highest penetrating power