Answer
c) $75\%$
Work Step by Step
Activity is reduced to half two times as the sample underwent two half-lives.
Remaining percentage= $100\%\times\frac{1}{2}\times\frac{1}{2}=25\%$
The activity is decreased by $100\%-25\%=75\%$
College Physics (7th Edition)
by Wilson, Jerry D.; Buffa, Anthony J.; Lou, Bo
Published by
Pearson
ISBN 10:
0-32160-183-1
ISBN 13:
978-0-32160-183-4
Chapter 29 - The Nucleus - Learning Path Questions and Exercises - Multiple Choice Questions - Page 995: 12
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