The Decay of 243 Mg of an Isotope Is Given $$\mathrm { A } ( \mathrm { t } ) = 243 \mathrm { e } ^ { - 0.014 \mathrm { t } }$$

question 337

Multiple Choice

The decay of 243 mg of an isotope is given by $$\mathrm { A } ( \mathrm { t } ) = 243 \mathrm { e } ^ { - 0.014 \mathrm { t } }$$ where t is time in years since the initial amount of 243 mg was present. Find the amount (to the nearest milligram) left after 72 years.

• A) 240
• B) 89
• C) 45
• D) 87

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