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in the chemical analyisis of a rock th...

in the chemical analyisis of a rock the mass ratio of two radioacctive isotopes is found to be 100: 1 the mean lives of the two isotope are `4xx10^(9)` yr and `2xx10^(9)` yr, respecively if it is assumed that at the time of formation the atoms of both the isotopes were on equal propartion ,, calculate the age of the rock . ratio of the atomic weights of the two isotope is 1.02:1 .

A

2

B

8

C

10

D

20

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The correct Answer is:
A
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