Physics

Radioactivity Solutions

The half-life of Plutonium-239 is 24,065 years. After 8.142 years, a sample of Plutonium 239 has been
reduced to a mass of 162.1456 mg.
What was the initial mass (in mg) of the sample? Round the solution to the nearest whole number,
mg
What is the mass of the sample 10,020 years after it was created? Round the solution to four decimal
places, if necessary
mg