List of top Physics Questions on Radioactivity asked in AP EAPCET

The half-life of a certain radio isotope is \(4\) minutes. The number of radioactive nuclei at a given instant is \(10^6\). Then the number of radioactive nuclei left \(2\) minutes later would be

The radioactivity of a certain radioactive element drops to 1/64 of its initial value in 30 sec. Its half-life is:

Two radioactive materials $A_1$ and $A_2$ have half-life periods 20 s and 10 s respectively. Initially a mixture of these materials contain 40 g of $A_1$ and 160 g of $A_2$. The time taken for $A_1$ and $A_2$ to become equal in the mixture is:

The half-life of a radioactive substance is 10 days. The decay constant is

A radioactive element of mass \(1\ \text{kg}\) after \(N\) years is left with only \(125\ \text{g}\). If the half-life of the element is \(12.5\) years, then the value of \(N\) is

A radioactive substance has a half life of \(10^8\) years and an activity of \(10^4\ \text{Bq}\). The number of atoms of this substance present is: