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)

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 6.0xx10^11 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?

Radioactive ""^(131)I has a half-life of 8.0 days. A sample containing ""^(131)I has activity 20mu Ci at t = 0. (a) What is its activity at t = 4.0 days? (b) What is its decay constant at t = 4.0 days?

In which of the following radioactive isotopes I -131 is not used?

In which of the following radioactive isotopes I -131 is not used?

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 ?