If `12g` of a sample is taken, then `6g` of a sample decays in `1 hr`. Find the amount of sample showing decay in next hour.

20% radioactive sample decay in time t. How much sample decay in time 2t ?

4xx10^23 tritium atoms are contained in a vessel. The half-life of decay of trituim nuclei is 12.3 y. Find (a) the activity of the sample ,(b) the number of decays in the next 10 hours (c ) the number of decays in the next 6.15 y.

4xx10^23 tritium atoms are contained in a vessel. The half-life of decay of trituim nuclei is 12.3 y. Find (a) the activity of the sample ,(b) the number of decays in the next 10 hours (c ) the number of decays in the next 6.15 y.

It is observed that only 6.25% of a given radioactive sample is left undecayed after a period of 16 days. What is the decay constant of this sample in day^-1 ?