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:The half-life of a radioactive substance is 15…The number of protons in an element increased by one…A radioactive isotope has a decay constant of…If the decay constant of a radioactive substance is…A radioactive element has a decay constant of…SEE ALSO Bohr’s atomic model proves most successful for the explanation of the... Which of the statements above is/are correct?