Consider a sample of a pure beta-active material

A sample of radioactive material A, that has an activity of 10 mCi(1 Ci=3.7xx10^(10)decays//s) , has twice the number of nuclei as another sample of a different radioactive material B which has an activity of 20 mCi. The correct choices for half-lives of A and B would then be respectively :

A sample of radioactive material A, that has an activity of 10 mCi(1 Ci=3.7xx10^(10)decays//s) , has twice the number of nuclei as another sample of a different radioactive material B which has an activity of 20 mCi. The correct choices for half-lives of A and B would then be respectively :

The activity of a given sample of radioactive material is reduced to (1/32) of its initial value in 25 days. The half life in days is

Four thousand active nuclei of a radioactive material are present at t= 0. After 60 minutes 500 active nuclei are left in the sample. The decay constant of the sample is

Four thousand active nuclei of a radioactive material are present at t= 0. After 60 minutes 500 active nuclei are left in the sample. The decay constant of the sample is

In a sample of radioactive material, what percentage of the initial number of active nuclei will decay during one mean life ?

In a sample of radioactive material, what percentage of the initial number of active nuclei will decay during one mean life?

In a sample of radioactive material, what percentage of the initial number of active nuclei will decay during one mean life ?

In a sample of radioactive material, what percentage of the initial number of active nuclei will decay during one mean life ?