Question

The half-life period of radium is 1600 years. Its average life time will be.

• A. 3200 years
• B. 4800 years
• C. 2319 years
• D. 4217 years

Answer 1

Answer: (C)

2319 years

Answer 2

Average life $\frac{1}{\lambda} = \frac{1600}{0.693} = 2308 \approx 2319$ years.