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The half-life of a radioactive isotope X...

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 a given rock. The age of the rock is estimated to be

A

`40 yr`

B

`60 yr`

C

`80 yr`

D

`100 yr`

Text Solution

Verified by Experts

The correct Answer is:
B
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