The half-life of a radioactive element is 5. Calculate its decay constant? By: Sunday|Published on: Aug 27|Categories: Physics WAEC| 0 comments A. 0.113s‾¹ B. 0.436 s‾¹ C. 0.139 s‾¹ D. 0.193 s‾¹ Correct Answer: Option C – 0.139 s‾¹ Users Also Read These:A radioactive substance has a half-life of 20 hours.…A radioactive element has a half life of 4 days. The…A radioactive element has a decay constant of…A radioactive substance has a half-life of 20 hours.…In 24 days a radioactive isotope decreases in mass…SEE ALSO The process of energy production in the sun is?