A radioactive isotope has an activity of 844 mci after 400, Physics

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A radioactive isotope has an activity of 844 mci after 400

Solve the each problem given below:

Problem I: A radioactive isotope has an activity of 8.44 mCi. After 4.00 hours the activity is 5.40 mCi. What is the half-life of the isotope?

Problem II: What is the activity after an additional 4.00 hours in mCi units?

Please explain the equations and steps are used to get the answer. Thanks!

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Physics: A radioactive isotope has an activity of 844 mci after 400

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Physics: A radioactive isotope has an activity of 844 mci after 400

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