Carbon-11 Has a Half-Life of 20 Minutes

question 5

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 1 hour if the starting material is 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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