What percentage of a radioactive substance will left undecayed after four half-life periods?

What % age of a given mass of a radioactive substance will be left undecayed after five half life periods?

What percentage of radioactive substance is left after 5 half lives?

The decay constant of a radioactive substance is 1 per month. The percentage of radioactive substance left undecayed after two months will be

What percentage (approximate) of original radioactive substance left after 4 half-Life?

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 ?

The half life period of a radioactive element is 90 minutes. What percentage of radioactive element will be present after 6 hours of decomposition ?

4 grams of radioactive substance A left 1//2 gm after some ture. 1 gran of another radioactive substance B left 1//4 gm in the same period, If half life of B is 2 hours, the half life of A is ( in hours)