List of top Physics Questions on Radioactivity asked in CUET (UG)

Under the action of a given coulombic force the acceleration of an electron is $2.5 \times 10^{22}\text{ m s}^{-2}$. Then the magnitude of the acceleration of a proton under the action of same force is nearly

The half-life of a radioactive substance is $10$ days. The fraction of the original sample left after $30$ days is:

A radioactive isotope phosphorous-32 has an initial activity 10μCi and has half life of 14 days. What is the activity of the source after 42 days?