# The half-life of the radioactive substance strontium-90 is 29 years. Suppose a sample of rock contains 250

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## Question:

(b) What is the continuous decay rate of strontium-90?

(c) How long will it be before the rock sample contains only 6 grams of strontium-90?

(d) At one point the sample contained 900 grams of strontium-90. How long ago was that?

(e) What percentage of the strontium-90 will be left in 900 years?

**Related Book For**

## A First Course in Differential Equations with Modeling Applications

ISBN: 978-1305965720

11th edition

Authors: Dennis G. Zill