List of top Physics Questions on Decay Rate asked in AP EAPCET

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

2 kg of a pure radioactive substance after a passage of \(N\) years is left with only 125 g of pure substance. The half-life of the radioactive substance is 12.5 y. Find the value of \(N\).

A radioactive element \(A\) converts into another stable element \(B\). Half-life of \(A\) is \(1.5\,\text{hrs}\). After time \(t\), the ratio of atoms of \(A\) and \(B\) is found to be \(1:8\), then \(t\) in hours is