One gram of a radioactive element decays by `beta`-emission to 0.125 in 200 hours. How much more time will elapse only 0.10 g of it is left?

One gm of an element decays by beta -emission to 0.125 gm in 200 years . The half life period of the reaction is

One gram of a radioactive element reduces to 200 mg in 10 days. Then the mass of the sample at the end of another 10 days is (in mg)

The half-life of a radioactive element is 10 hours. How much will be left after 4 hours in 1g atom sample?

The half-life period of a radioactive material is 5 hours. In how much time 15/16 of the material will decay?

A radioactive element has a half life of 20 minutes, How much time should elapse before the element is reduced to 1//8 of its original value

A radioactive element decays by beta- emission. A detector racords n -beta particles in 2 sec and in next 2 sec it records 0.65n -beta particles. Find mean life.