The Decay of 514 Mg of an Isotope Is Given $A ( t ) = 514 e ^ { - 0.021 t }$

question 266

Multiple Choice

The decay of 514 mg of an isotope is given by A( $A ( t ) = 514 e ^ { - 0.021 t }$ , where t is time in years. Find the amount left after 63 years.

• A) 503 mg
• B) 134 mg
• C) 69 mg
• D) 137 mg

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