The half-life period of radium is 1600 years. Its average lifetime will be:
A
3200 years
B
4800 years
C
2319 years
D
4217 years
Correct Option:
C
Explanation
Average life is related to half-life by τ = T₁/₂ / ln 2. Using the common approximation ln 2 ≈ 0.69, τ ≈ 1600/0.69 ≈ 2319 years, so option C is the intended answer.
