Question

Mean life of a radioactive element is one year. Then its half life is (in year)

• A. 0.5
• B. 0.8
• C. 1
• D. 0.693

Answer 1

Answer: (D)

0.693

Answer 2

$T_{1/2} = 0.693/ \lambda = 0.693$ Tav = $0.693 \times$1 = 0.693 year