A sample of radioactive isotope is found to have an activity of 110 Bq imediately after it is pulled from the reactor that formed the isotope. Its activity 1 h, 20 min later is measured to be 89 Bq. Find the decay constant of the sample. Answer in units of h-¹. Find the half-life of the sample. Answer in units of h. How many radioactive nuclei were there in the sample initially?

A sample of radioactive isotope is found to have an activity of 110 Bq imediately after it is pulled from the reactor that formed the isotope. Its activity 1 h, 20 min later is measured to be 89 Bq. Find the decay constant of the sample. Answer in units of h-¹. Find the half-life of the sample. Answer in units of h. How many radioactive nuclei were there in the sample initially?