In the chemical analysis of a rock, the mass ratio of two radioactive isotopes (A and B) is 100:1 and the ratio of their atomic weights is 1.02:1. If tau_(A)=4xx10^(9) year & tau_(B)=2xx10^(9) year and the two isotopes are in equal proportion at formation, the age of the rock is nearly nxx(10)^(10) year where n= _______ (take log_(10)((100)/(1.02))=1.9914 )

In the chemical analysis of a rock, the mass ratio of two radioactive

1.	In the chemical analysis of a rock, the mass ratio of two radioactive isotopes (A and B) is 100:1 and the ratio of their atomic weights is 1.02:1. If tau_(A)=4xx10^(9) year & tau_(B)=2xx10^(9) year and the two isotopes are in equal proportion at formation, the age of the rock is nearly nxx(10)^(10) year where n= _______ (take log_(10)((100)/(1.02))=1.9914 )
Answer» 2 8 10 20 Answer :A

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