Published by:
CGP EDU Academic Team
Published on: August 13, 2026
A sample initially contains only 
isotope of uranium. With time, some of the 
radioactively decays into 
-206 while the rest of it remains undisintegrated. When the age of the sample is 
years, the ratio of mass of 
to that of 
in the sample is found to be 7. The value of 
is . [Given : Half-life of 
is 
years; 
]
Text Solution
Verified by ExpertsThe correct answer is:
143
(143)
Life of sample 
t years
Initial mole of U-238
Final mole of U-238
years
years
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