A freshly prepared sample of a certain radioactive isotope has an activity of 10 mCi. After 4.00 h, the activity is 8.00

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answerhappygod
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A freshly prepared sample of a certain radioactive isotope has an activity of 10 mCi. After 4.00 h, the activity is 8.00

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A freshly prepared sample of a certain radioactive isotope has
an activity of 10 mCi. After 4.00
h, the activity is 8.00 mCi.(a) Find the decay constant and half
life of the isotope.(b) How many
atoms of the isotope were contained in the freshly prepared
sample?(c) What is the sample’s
activity 30 h after it is prepared?
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