A radioactive element A with a half‐value period of 2 hours decays giving a stable element Y. After a time 
the ratio of 
and 
atoms is 1: 7. then 
is:
Text Solution
Verified by ExpertsThe correct answer is:
A
After lapse of time 
, let the number of atoms of 
element and 
element be respectively 
and 
Then 
or 
or 
or 
Death of an atom of mother element means the birth of an atom of daughter element.
But 
hours, hence 
hours
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