In the reaction $_{93}Np^{239} \xrightarrow{} _{94}Pu^{239} + (?)$,the missing particle is

The $\beta$-decay of $_{11}Na^{24}$ produces an isotope of

What kind of radioactive decay does not lead to the formation of a daughter nucleus that is an isobar of the parent nucleus?

The radiations from a naturally occurring radio element,as seen after deflection in a magnetic field in one direction,are

In the following nuclear reaction,identify $x$: $_{29}Cu^{64} \to _{28}Ni^{64} + x$

Which of the following is used in dating archaeological findings,or in a method of absolute dating of fossils,a radioactive element is used. It is: