Question

The half life of a radioactive element is $40$ days. Calculate the average life:

• A. 5.76 days
• B. 57.6 days
• C. 646 days
• D. 4.56 days

Answer 1

Answer: (B)

We know
Average life $(T)=1.44\times$ half life $\left(t_{1/2}\right)$
Hence $T=1.44\times 40$
or $T=57.6$ days
So, average life of that radioactive element is $57.6$ days.