Ratio of initial active nuclei in two different sample is 2:3 Their hafl lives are one hour and two hours respectively . Ratio of active nuclei at the end of 6 hours will be :

Initial ratio of active nuclei in two different sample is 2: 3 their half lives are 2 hr and 3hr respectively . Ratio of their activities at the end of 12 hr is :

Two radioactive samples consist of equal number of atoms. The half lives are 2 hours and 4 hours respectively. The ratio of their activities then is

The number of nuclei of two radioactive substance is the same and their half-lives are 1 year and 2 years respectively. The ratio of their activities after 6 years will be

The number of nuclei of two radioactive substance is the same and their half-lives are 1 year and 2 years respectively. The ratio of their activities after 6 years will be

Two samples of different radioactive substances initially have the ratio of active nuclei 4 : 1 and then half lives are 12 hr. and 16 hr. respectively. Find the ratio of active nuclei of the two samples after 2 days.

Two radioactive substances X and Y initially contain an equal number of atoms. Their half-lives are 1 hour and 2 hours respectively. Then the ratio of their rates of disintergration after two hours is

Two radioactive substances X and Y initially contain an equal number of atoms. Their half-lives are 1 hour and 2 hours respectively. Then the ratio of their rates of disintergration after two hours is

Two nuclei P, Q have equal number of atoms at t = 0. Their half-lives are 3 hours and 9 hours respectively. Compare their rates of disintegration, after 18 hours from the start.