The half-life of a radioactive substance is 2 seconds. Calculate the decay constant?

A. 0.035s−¹
B. 0.151s−¹
C. 0.347s−¹
D. 0.576s−¹
E. 1.386s−¹

Correct Answer:

Option C – 0.347s−¹

Explanation

λ=0.693/T½ = 0.6932

= 0.347s−¹