Radio isotope X with a half - life 
decays to Y which is stable. A sample of the rock from a cave was found to contain 
and 
in the ratio 
. The age of the rock is
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
C
Let the initial total mass is m.
Only 
part remains left undecayed
Number of half-lives involved are three,
So, time taken to becomes 
unstable part
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