A) 5.76 days
B) 57.6 days
C) 646 days
D) 4.56 days
Correct Answer: B
Solution :
We know, Average life\[(T)=1.44\times half\text{ }life\text{ }({{t}_{-1/2}})\]) Henc, \[T=1.44\times 40\] or T= 57.6 days So, average life of that radioactive element is 57.6 days.
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