Question 6. At Canadian Light Source, a synthetic radioisotope is freshly prepared. The initial activity of the radioisotope is 10.0 mCi, and the activity changes to 0.08 pCi in 25.0 hours. (a) What is the decay constant and half-life of the synthetic radioisotope sample in sec- onds? (3 +2 marks) (b) What is the sample's activity in p Ci 50.0 hours after it is prepared? (2 marks) (c) After how many half-lives, will a 2.00% of this synthetic sample remain