Answer
$670KHz$
Work Step by Step
The frequency of the station can be determined as
$f=\frac{c}{\lambda}$
$\implies f=\frac{c}{4L}$
We plug in the known values to obtain:
$f=\frac{3.00\times 10^8}{4(112)}=670KHz$
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 25 - Electromagnetic Waves - Problems and Conceptual Exercises - Page 902: 40
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