An isotope has an initial activity of 120 Bq. 6 days later its activity is 15 Bq. The half-life is? by Sunday | Jan 11 | Physics JAMB | 0 comments A. 3 days B. 2 days C. 1 day D. 4 days Correct Answer: Option A = 3 days Users Also Read These:An isotope has an atomic number of 15 and a mass…A radioactive element has a half life of 4 days. The…A radioactive substance has a half-life of 20 days…The count rate of an alpha-particle source is 400…Chlorine consisting of two isotope of mass number 35…