Answer
$0.025 s$
Work Step by Step
$T=\frac{1}{f}$
T is the period and f is the frequency of the oscillation.
If, $f=40 Hz$, then $T=\frac{1}{f}=\frac{1}{40}=0.025s$
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 13 - Vibrations and Waves - Learning Path Questions and Exercises - Exercises - Page 484: 4
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