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Carbon-11 Has a Half-Life of 20 Minutes

Question 131

Multiple Choice

Carbon-11 has a half-life of 20 minutes. Which of the following equations is used to calculate the amount of carbon-11 remaining after one hour if the starting material a 100-mg sample?


A) 100 mg ½
B) 100 mg/3
C) 100 mg/20
D) 100 mg/20/20/20
E) 100 mg ½ ½ ½

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