Physics Technology Update (4th Edition)

Published by Pearson
ISBN 10: 0-32190-308-0
ISBN 13: 978-0-32190-308-2

Chapter 32 - Nuclear Physics and Nuclear Radiation - Problems and Conceptual Exercises - Page 1153: 28

Answer

One day.

Work Step by Step

We know that half life is the time taken for one half of the element to decay. The amount of substance decreases by a factor of two in one half life and by a factor of $\frac{1}{4}$ in two half lives. We are given that after two days, $\frac{1}{4}$ of the sample is still radio active. Thus, the half life of the given radioactive is one day.
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