(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

Plutonium 239 (P-239) decays at a rate of 0.00284 percent per year. If the initial sample size

of P-239 is 10 g, how much will remain as P-239 after 20,000 years?

2. Relevant equations

A=A0e^-rt

3. The attempt at a solution

A=10e^-0.00284*20000

lnA=ln10+lne^-56.4

lnA=1-56.4

A=8.7*10^-25

This answer doesn't seem reasonable and I don't have confidence that I did everything correctly.

**Physics Forums | Science Articles, Homework Help, Discussion**

Dismiss Notice

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: Ammount of plutonium left

**Physics Forums | Science Articles, Homework Help, Discussion**