Question

What is the average life of a radioactive element whose half-life is 30 days ?

• A. 03
• B. 15.21
• C. 20.79
• D. 29

Hint:

To find the average life of any radioactive element, simply multiply its half-life by the constant factor 1.443 (since $\tau = 1.443 \times T_{1/2}$). For 30 days, $30 \times 1.443 = 29\text{ days}$.

Answer 1

The Correct Option is D