What is steady state number of I after a long time?
A radioactive sample of U238 decay to Pb through a process for which half life is 4.5×109 years. The ratio of number of nuclei of Pb to U238 after a time of 1.5×109 years.
(Given 21/3 = 1.26)
At radioactive equilibrium, the ratio between the number of the atoms of two radioactive elements (X) and (Y) was found to be 3.2×109 : 1 respectively. If half-life of the element (X) is 1.6×1010 years, then half-life of the element (Y) would be