A) 576 days
B) 57.6 days
C) 646 days
D) 4.56 days
Correct Answer: B
Solution :
We know Average life (T) = 1.44 x half life \[({{t}_{1/2}})\] Hence \[T=1.44\times 40\] or \[T=57.6\text{ }days\] So, average life of that radioactive element is 57.6 days.
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