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:How many days are allowed in life insurance as days…A radioactive substance has a half-life of 3 days.…Chlorine consisting of two isotope of mass number 35…The atomic number of an isotope of hydrogen is equal…A gas with initial volume of 2 X 10^-6 m³ is allowed…