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How much Cu-61 (half-life about 3 hours) would remain from a 2 mg sample after 9 hours?
Updated: 4/28/2022
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∙ 9y agoBest Answer
.25 mg
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∙ 9y agoThis answer is:
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How much Cu-61 would remain from a 2 mg sample after 6 hours?
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How much Cu-61 would remain from a 2 mg sample after 9 hrs?
.25 mg
How much Cu-61 (half-life about 3 hours) would remain from 2 mg sample after 6 hours?
6 hours = 2 half lives, thus 25 % would remain. 0.25 x 2 mg = 0.5 mg.Done another way...fraction remaining = 0.5^n where n = number of half lives = 6hr/3hr = 2fraction remaining = 0.5^2 = 0.250.25 x 2 mg = 0.5 mg
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