Solved: The U.S. Navy has long proposed the construction
Chapter 21, Problem 21.78(choose chapter or problem)
The U.S. Navy has long proposed the construction of extremely low frequency (ELF waves) communications systems; such waves could penetrate the oceans to reach distant submarines. Calculate the length of a quarterwavelength antenna for a transmitter generating ELF waves of frequency 75 Hz. How practical is this antenna?
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