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 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, 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.

Two nuclei P, Q have equal no.of atoms at t= 0. Their half-life are 3 hours, 9 hours. Compare their rates of disintegration after 18 hrs from the start.

Two nuclei P, Q have equal no.of atoms at t= 0. Their half-life are 3 hours, 9 hours. Compare their rates of disintegration after 18 hrs from the start.

Two radioactive substances X and Y initially contain equal number of atoms. Their half-lives are 1 hour and 2 hours respectively. Calculate the ratio of their rates of disintegration after four hours.

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