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

Question

Quizplus · Accepted Answer

To find the amount left after 63 years, substitute $t = 63$ into the given formula: $A(63) = 514e^{-0.021 \times 63}$. Calculating this gives approximately 137 mg.

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

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