The half-life of a radioactive isotope is the amount of time it takes for a quantity of radioactive material to decay to one-half of its original amount. i) The half-life of Carbon 14 (C-14) is 5230 years. Determine the decay-rate parameter for C − 14. ii)The half-life of Iodine 131 (I-131) is 8 days. Determine the decay-rate param- eter for I − 131. 2. Relevant equations dx/dt = -bx where b is a constant 3. The attempt at a solution i) let x(t) be the quantity of radionactuve meterial at time t in year and dx/dt be the rate of change of the quantity. dx/dt = -bx where b is a constant I dun no how to process after doing this assumption. Please help to give some hints on doing these questions. Many thanks!