The ratio of the atoms of two elements A and B at radioactive equilibrium is `5.0 xx 10^(5)` : 1 respectively. Calculate half life of B if half life of A is 245 days.

The decay constant of radioactive substance is 4.33 xx 10^(-4) per year. Calculate its half life period .

The decay constant of a radioactive material is 5 xx 10^(-4) per year.find its half-life period.

At radioactive equilibrium, the ratio between two atoms of radioactive elements A and B is 3.1 xx 10^(9) : 1 . If the half-life period of A is 2 xx 10^(10) years, what is the half-life of B ?

The decay constant of a radioactive element is 1.05xx10^(-4) / year. What is its half life ?

In a sample there are two radioactive nuclide X and Y. Initially, population of X is 2.5 tiems that of Y. it was observed that 3 days later the population of X becomes 5.0 times that of population of Y. Find the half life of X it half life of Y is 2.0 days.

At radioactive equillibrium, the ratio between two atoms of radioactive element X and Y are 3.1xx10^(9):1 , If half life period of X is 2.17xx10^(10) years. Find half life of Y .