1. The problem statement, all variables and given/known data A sample of radioactive isotope is found to have an activity of 120 Bq imediately after it is pulled from the reactor that formed the iso- tope. Its activity 1 h 55 min later is measured to be 85.8 Bq. Find the decay constant of the sample. An- swer in units of h^-1. 2. Relevant equations 1Bq= 1 decay/sec ln(2)/k= t(half-life) 3. The attempt at a solution 120-85.8/(115*60)?