Question

17. The half life of a radioactive substance is 13
years. The decay constant is
1) 1.69 x 10-10 S- 2) 1.96 x 10-9S -
3) 1.69 x 10-9 S-! 4) 1.29 X 10- S-​

Answer 1

Explanation:

Here, λ=4.33×10−4 per year

t1/2=λ0.6931

t1/2=4.33×10−40.6931=0.16×104 s