NEET | 2013Nuclear Physics and RadioactivityHard

Question

The half life of a radioactive isotope ′X′ is 20 years. 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:

Options

A.100 years
B.40 years
C.60 years
D.80 years

Solution


X → Y (stable)
NX      Ny 

By using , we have
years = 60 years.

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