Extremely low-frequency (ELF) waves that can penetrate the oceans are the only practical means of communicating with distant submarines. (a) Calculate the length of a quarter-wavelength antenna for a transmitter generating ELF waves of frequency 76.5 Hz into air. mi (b) How practical is this means of communication?
Extremely low-frequency (ELF) waves that can penetrate the oceans are the only practical means of communicating with distant submarines. (a) Calculate the length of a quarter-wavelength antenna for a transmitter generating ELF waves of frequency 76.5 Hz into air. mi (b) How practical is this means of communication?
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Transcribed Image Text:Extremely low-frequency (ELF) waves that can penetrate the oceans are the only practical means of communicating with distant submarines.
(a) Calculate the length of a quarter-wavelength antenna for a transmitter generating ELF waves of frequency 76.5 Hz into air.
mi
(b) How practical is this means of communication?
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