Question: A freshly prepared sample of a certain radioactive isotope has an activity of 10.0 mCi. After 3.90 h, the activity is 7.80 mCi. (a)

A freshly prepared sample of a certain radioactive isotope has an activity of 10.0 mCi. After 3.90 h, the activity is 7.80 mCi. (a) Find the decay constant and half-life of the isotope. T1/2 4.00.0637 4.0 10.88 h-1 You appear to be correctly calculating the half-life using your incorrect result for the decay constant. Check the number of significant figures. h (b) How many atoms of the isotope were contained in the freshly prepared sample? 4.02.09E13 atoms (c) What is the sample's activity 30 h after it is prepared? 4.01.479 You appear to be correctly calculating this using your incorrect result for the decay constant. Check the number of significant figures. mCi

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Problem Summary A freshly prepared radioactive sample has Initial activity A 0 100 mCi A0 100 textmCi A0100mCi Activity after t 390 h t 390 texth t390... View full answer

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