A radioactive element `A` with a half-value period of `2` hours decays giving a stable element `Y`. After a time `t` the ratio of `X` and `Y` atoms is `1 : 7` then `t` is :

A radioactive element X with half life 2 h decays giving a stable element Y. After a time t, ratio of X and Y atoms is 1:16 .Time t is

A radioactive element X with half life 2 hrs decays giving a stable element Y. After a time t , ratio of X to Y atoms is 1 : 15 . Time t is.

A radioactive element X with half life 2 h decays giving a stable element Y. After a time t, ratio of X and Y atoms is 1:16 .Time t is

A radioactive element X converts into another stable element Y . Half life of X is 2 hours. Initially only X is present . After a time t if the ratio of atoms of X to Y is 1:4 then the value of t is

A radioactive element X converts into another stable elemnet Y . Half-life of X is 2h . Initally, only X is present. After time t , the ratio of atoms of X and Y is found to be 1:4 Then t in hours is .

A radioactive element X converts into another stable elemnet Y . Half-life of X is 2h . Initally, only X is present. After time t , the ratio of atoms of X and Y is found to be 1:4 Then t in hours is .

A radioactive isotope X with half-life 1.5xx10^9 y decays into a stable nucleus Y. A rock sample contains both elements X and Y in ratio 1:15. Find the age of the rock .

A radioactive isotope X with half-life 1.5xx10^(9) yr decays into a stable nucleus Y .A rock sample contains both elements X and Y in the ratio 1 : 15. They age of the rock is