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5. A Geiger counter measures the activity of a sample of a particular radioisotope to be...

5. A Geiger counter measures the activity of a sample of a particular radioisotope to be 6400 counts per minute. Four hours later, the counter measures 25 counts per minute for the same sample.

a. What is the half-life of the sample?

b. Is this sample likely to be dangerous for a long period of time? Why?

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