The half life of a radioactive isotope 
is 50 years. It decays to another element 
which is stable. The two elements 
and 
were found to be in the ratio of 1 : 15 in a sample of a given rock. The age of the rock was estimated to be
Text Solution
Verified by ExpertsThe correct answer is:
B
where 
is number of halflives
or 
or 
Let the age of rock be 
years.
or 
years 
years
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