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A freshly prepared sample of a certain r...

A freshly prepared sample of a certain radioactive isotope has an activity of 10mCi. Afte 4.0h its activity is 8.00 mCi.
(a) Find the decay constant and half-life
How many atoms of the isotope were contained in the freshly preapared sample?
(c) What is the sample's activity 30.0 h after it is prepared?

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