The half - life of a radioactive substance is 60 years. Calculate its decay constant given `log e 2=6930`

Half life of a radioactive material is 3600 years. Calculate the decay constant.

The half life of a radioactive substance is 13 years. The decay constant is

The half life of a radioactive substance is 20s. Calculate (i) the decay constant, and (ii) time take by the sample to decay by 7//8th of its inital value

The half-life of a radioactive substance is 100 years. Calculate in how many years the activity will decay to 1//10^(th) of its initial value.