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A student is instructed to design a device that can allow one user to hear the voice of another user at a distance of 5 kilometers. Which statement describes the MOST applicable basic design concept?
A.
A device designed to create a strong magnetic field should be developed.
B.
A device designed to turn an electric current into heat should be developed.
C.
A device designed to produce waves with large amplitudes should be developed.
D.
A device designed to transmit electromagnetic waves through the air should be developed.
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D.
To send a voice 5 km you convert the acoustic signal to an electrical signal and radiate it as electromagnetic waves (radio) for wireless transmission and reception. The other choices (strong magnetic field, heating an electric current, or merely increasing amplitude) do not address long-distance wireless signal transmission.
To send a voice 5 km you convert the acoustic signal to an electrical signal and radiate it as electromagnetic waves (radio) for wireless transmission and reception. The other choices (strong magnetic field, heating an electric current, or merely increasing amplitude) do not address long-distance wireless signal transmission.
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