The half-life of the radium isotope Ra-226 is approximately 1,599 years. What percent of a given amount remains after 800 years? Round your answer to two decimal places.
A)70.70 %
B)5.71 %
C)72.70 %
D)25.02 %
E)0.71 %

Question

Quizplus · Accepted Answer

The half-life formula is used to calculate the remaining amount: N(t) = N0 * (1/2)^(t/T), where t is the time elapsed and T is the half-life. For 800 years, N(t) = N0 * (1/2)^(800/1599) ≈ 70.70%.

The Half-Life of the Radium Isotope Ra-226 Is Approximately 1,599