Published by:
CGP EDU Academic Team
Published on: August 14, 2026
In nature a decay chain series starts with 
and finally terminates at 
A thorium ore sample was found to contain 
of helium at STP and 
of 
Find the age of the ore sample assuming the source of helium to be only decay of 
. Also assume complete retention of helium within the ore. (Half life of 
years)
A
years
B
years
C
years
D
years
Text Solution
Verified by ExpertsThe correct answer is:
B
No. of moles of helium 
No. of 
moles which have disintegrated 
Mass of 
which have disintegrated
Mass of 
left, 
Applying 
years
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