A radioisotope of silver has half-life of 20 minutes.What fraction of the original mass would remain after one hour?

What fraction of an hour is 40 minutes?

The half-life of ._(6)^(14)C is 5730 year. What fraction of its original C^(14) would left after 22920 year of storage?

50 % of first order reaction gets completed in 16 minutes. What fraction of the reaction would occur in 32 minutes :

The decomposition of sulphuryl chloride to SO_2 and Cl_2 is a first order reaction whose half life is 30 minutes. What percentage of the reactant will be decomposed in 2 hours ?

Sucrose decomposes in acid solution into glucose and fructose according to the first order rate law, with t_(1/2) =3.00 hours. What fraction of sample of sucrose remains after 8 hours?

After five half life periods for a first order reaction what fraction of reactant remains ?

A point source of gamma - radiatonhas a half-life of 30 minutes.The intitial count rate recorded by Geiger counter placed 2 m from the source is 360 s^(-1) .The distnace between the counter and the source is altered.After 1.5 hours,the count rate recorded is 5 s^(-1) .What is th new distnace between the counter and the source?

Two radioactive nuclei X and Y initially contain an equal number of atoms.Their half life is 1 hour and 2 hours respectively.Calculate ratio of their rates of disintegration after two hours.