Half‐lives of two radioactive substances 
and 
are respectively 20 minutes and 40 minutes. Initially the samples of 
and 
have equal number of nuclei. After 80 minutes the ratio of remaining numbers of 
and 
nuclei is
Text Solution
Verified by ExpertsThe correct answer is:
A
For 
half lives
No. of atoms left 
For 
half lives
No. of atoms left 
Ratio 
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