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A synthetic radioisotope is freshly prepared in a lab that has an activity of 10.0 mCi....

A synthetic radioisotope is freshly prepared in a lab that has an activity of 10.0 mCi. If the activity of the radioisotope changes to 8.00 mCi, in 5.00 h, a) What is the decay constant and half-life of the radioisotope in seconds ?, b) How many atoms of the radioisotope were contained in the freshly prepared sample? c) What is the sample’s activity in mCi 40.0 h after it is prepared ?

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