A radioactive isotope X with half-life of `693xx10^(9)` years decay to Y which is stable. A sample of rock from of the moon was found to contain both the elements X Y in the mole ratio `1:7` . What is the age of the rock ?

A radioactive isotope X with a half-life of 1.37 xx 109 years decays to Y which is stable. A sample of rock from the moon was found to contain both the elements X and Y which were in the ratio of 1 : 7 . The age of the rock is.

The radioactive isotope X with a half-life of 10^(9) decays to Y which is stable. A sample of rocks was found to contain both the elements X and Y in the years ratio 1: 7 . If initially, the quantity of Y in the rock was zero, then the age of the rocks is

A radio isotope X with a half-life 1.4 xx 10^9 years decays of Y which is stable. A sample of the rock from a cave was found to contain X and Y in the ratio 1 : 7 . The age of the rock is.

A radio isotope X with a half life 1.4xx10^(9) yr decays of Y which is stable. A sample of the rock from a cave was found to contain X and Y in the ratio 1:7 . The age of the rock is

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

The half-life of a radioactive isotope X is 20 years. It decays to another element Y which is stable. The two elements X and Y were found to be in the ratio of 1 : 7 in a sample of a given rock. The age of the rock was estimated to be.

The half-life of a radioactive isotope X is 50 years. It decays to another element Y which is stable. The two elements X and Y were found to be in the ratio of 1 : 15 in a sample of a given rock. The age of the rock was estimated to be

The half-life of a radioactive isotope X is 20 yr . It decays to another element Y which is stable. The two elements X and Y were found to be in the ratio 1:7 in a sample of given rock. The age of the rock is estimated to be