Mass spectrometic analysis of potassium and argon atoms in a Moon rock sample shows that the
Channel: Doubtnut
Date: 19/01/2020

Mass spectrometic analysis of potassium and argon atoms in a Moon rock sample shows that the ratio of the number of (stable)`.^(40)`At atoms present to the number of (radioactive)`.^(40)K` atoms is `10.3`.Assume that all the argon atoms were produced by the decay of potassium atoms, with a half-life of `1.25 xx 10^(9) yr`. How old is the rock ?