Answer
$2$
Work Step by Step
It is given that samples A and B have equal half lives and the activity of A is twice that of B, i.e. $2A_A=A_B$. Thus, the ratio of activity of sample A to that of B is $2.0$ after two half lives have elapsed.
Physics Technology Update (4th Edition)
by Walker, James S.
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 1154: 65
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