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Show work please A physics professor purchased a 13/Cs source in September 1990, which had an activity of 2.00 x 10' disintegrations per second at

Show work please

A physics professor purchased a 13/Cs source in September 1990, which had an activity of 2.00 x 10' disintegrations per second at that time. What is the activity of that source today? (The half-life of 137Cs is 30.2 years.) Show your work

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