The half-life of a radioactive element is 5. Calculate its decay constant? by Sunday | Aug 27 | 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 isotope has a decay constant of…The half-life of a radioactive substance is 2…The number of protons in an element increased by one…If the decay constant of a radioactive substance is…A radioactive substance has a half-life of 20 hours.…