The half-life of the radium isotope Ra-226 is approximately 1,599 years. What percent of a given amount remains after 200 years? Round your answer to two decimal places.

Name: The half-life of the radium isotope Ra-226 is approximately 1,599 years. What percent of a given amount remains after 200 years? Round your answer to two decimal places.
Brand: Quizplus
Rating: 4.8 (50 reviews)

Question

The half-life of the radium isotope Ra-226 is approximately 1,599 years. What percent of a given amount remains after 200 years? Round your answer to two decimal places. ​

Quizplus · Accepted Answer

The decay formula is N(t) = N0 * (1/2)^(t/half-life). For Ra-226, after 200 years, N(t)/N0 = (1/2)^(200/1599) ≈ 0.9170 or 91.70%.

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