Question

If the radioactive decay constant of radium is $1.07 \times 10^{- 4}$per year, then its half life period is approximately equal to.

• A. 8,900 years
• B. 7,000 years
• C. 6,476 years
• D. 2,520 years

Answer 1

Answer: (C)

6,476 years

Answer 2

Half-life $T_{1/2} = \frac{0.693}{\lambda} = \frac{0.693}{1.07 \times 10^{- 4}} = 6476\mspace{6mu} years$