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 :

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 :

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

A radioactive nucleus can decay in two different processes with half life 0.7 hr and 0.3 hr . The

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.

The nuclei P and Q have equal number of atoms at t = 0. Their half-lives are 3 hr and 9 hr respectively. Compare their rates of disintegration after 8 hour from the start.

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

The radioactive sources A and B of half lives of 2 hr and 4 hr respectively, initially contain the same number of radioactive atoms. At the end of 2 hours, their rates of disintegration are in the ratio :