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:The count rate of radioactive material is 800…How many days are allowed in life insurance as days…The count rate of an alpha-particle source is 400…Chlorine consisting of two isotope of mass number 35…The atomic number of an isotope of hydrogen is equal…