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OpenStudy (anonymous):
An isotope of sodium has a half-life of 20 hours. Suppose an initial sample of this isotope has mass 10 grams. The amount of the isotope (in grams) remaining after t hours is given by: (NOTE: We're assuming exponential decay here. Use the exponential decay function.) The answer choices are in the attachment below:
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OpenStudy (anonymous):
jimthompson5910 (jim_thompson5910):
Simply plug in t = 20 into each answer choice and see what you get. You should get a result of 5 since 5 is half of 10.
OpenStudy (anonymous):
thanks.
OpenStudy (anonymous):
It was A.
jimthompson5910 (jim_thompson5910):
Yes you got the right answer. Nice job.
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