Suppose that you are given a 200 gram sample of a radioactive substance with a half-life of 45 days.  How many grams will be left after 360 days?

Principles of Physics: A Calculus-Based Text
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Author:Raymond A. Serway, John W. Jewett
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Chapter30: Nuclear Physics
Section: Chapter Questions
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1.Suppose that you are given a 200 gram sample of a radioactive substance with a half-life of 45 days.  How many grams will be left after 360 days?

2.  A radioactive substance is found to register 5000 counts per second on a Geiger counter.  Twenty-four hours later it registers 1250 counts per second.  What is its half-life?

3.  If a sample emits 2000 counts per second when the detector is 1 meter from the sample, how many counts per second would be observed when the detector is 3 meters from the sample?

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