The nucleus of a radioactive element possesses:

When a radioactive substance is subjected to vacuum,the rate of disintegration per second

In the decay,${}_Z^AX \to {}_{6}^{12}C + {}_{+1}^{0}\beta$,identify the values of $A$ and $Z$.

If two light nuclei are fused together in a nuclear fusion reaction,what happens to the average binding energy per nucleon?

The atomic mass of lead is $208$ and atomic number is $82$. The atomic mass of bismuth is $209$ and atomic number is $83$. The ratio of $n/p$ in the atom is

Who discovered the meson?