A radioactive substance contains `10^15` atoms and has an activity of `6.0xx10^11` Bq. What is its half-life?

A radioactive substance contains 10^(15) atoms and has an activity of 6.5 xx 10^(11) Bq. What is its half life.

A radioactive sample contains 1.00xx10^15 atoms and has an activity of 6.00xx10^11 Bq. What is its half-life?

A radioactive sample contains 1.00xx10^15 atoms and has an activity of 6.00xx10^11 Bq. What is its half-life?

Iiodine -131 is a radioactive isdotpe. If 1.0 mg of ""^(131)I has an activity of 4.6xx10""^(12) Bq. What is the half-life of ""^(131)I (in days)

Iiodine -131 is a radioactive isdotpe. If 1.0 mg of ""^(131)I has an activity of 4.6xx10""^(12) Bq. What is the half-life of ""^(131)I (in days)

Iodine -131 is a radioactive isdotpe. If 1.0 mg of ""^(131)I has an activity of 4.6xx10""^(12) Bq. What is the half-life of ""^(131)I (in days)

A radioactive substance has half-life of 50 sec and activity of 5 xx 10^12 becquerel. The time taken for activity to drop to 1.25 xx 10^12 is n xx 10^2 s.

A radioactive substances has half-life of 50 sec and activity of 5 xx 10^(12) Becquerel. Calculate the time taken for activity to drop to 1.25 xx 10^(12) .

A sample of radioactive material has an activity of 9xx10^(12) Becquerel. The material has a half life of 80s. How long will it take for the activity to falls to 2xx10^(10) Becquerel ?

The half life of a radioactive substance is 5xx10^(3) yrs. In how many years will its activity decay to 0.2 times its initial activity? Take log_(10) 5=0.6990 .