List of top Physics Questions on Radioactive Decay asked in TS EAMCET

In a time of \(10\) minutes, the activity of a radioactive sample becomes \[ \frac{1}{\sqrt5} \] times its initial activity. After \(10\) more minutes, if its activity becomes \(K\) times the initial activity, the value of \(K\) is

If the activities of a radioactive substance at times \(t=0\) and \(t=3T\) are A and B respectively, then the activity of the substance at a time \(t=9T\) is