List of top Physics Questions on deccay rate asked in EAMCET

The half-life of a radioactive element is $10 \,h$. The fraction of initial radioactivity of the element that will remain after $40\, h$ is

The half-life of $Ra ^{226}$ is 1620 years. Then the number of atoms decay in one second in $1 g$ of radium (Avogadro number $\left.=6.023 \times 10^{23}\right)$

In the nuclear reaction $ _{13}A{{l}^{27}}(d,\alpha )x,X $ is: