# Radioactive decay

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Find the half-life of a radioactive material if, after one year 99.5713% of the amount remains, also write the formula for finding the amount of this material after (t) years, and how much will remain in 500 years?

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##### Solution Summary

This solution finds the half-life of a radioactive material and the amount that will remain in 500 years.

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N(t)= N(0) exp (-lambda t)

where

N(t)= Amount at time t

N(0)= Amount at time 0

lambda = decay constant

t= time elapsed

...

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