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A freshly prepared sample of a certain radioactive isotope has an activity of 10.4 mCi. After...

A freshly prepared sample of a certain radioactive isotope has an activity of 10.4 mCi. After 4.20 h, its activity is 8.00 mCi.

(a) Find the decay constant and half-life. decay constant s-1 half-life h

(b) How many atoms of the isotope were contained in the freshly prepared sample?

(c) What is the sample's activity 33.7 h after it is prepared? mCi

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