Why are audio signals not transmitted directly by electromagnetic waves?
Answers
Answer: Due to the requirement of very long antennae.
Explanation:
Sound waves are longitudinal waves that travel through the air and are composed of compressions and rarefactions. Audio signals are electronic representations of these waves.
The wavelength of an electromagnetic wave with an audio signal frequency will be extremely long.
Since the required of antenna must be so long (=500m), setting it is virtually difficult. Also the audio signals sent from the various broadcasting stations will be mixed up independently.
As a result, these signals are not sent directly.
Answer:
Audio signals are not transmitted directly by electromagnetic waves as it is not possible to make antennas for the waves having higher wavelengths.
Explanation:
Audio signals are not transmitted directly by electromagnetic waves because the audio signals are having very low-frequency signals and for low-frequency signals, the wavelength is very high, and to transmit this high wavelength signal, the antenna size requirement is also very high. So, it is impractical to transmit audio signal by electromagnetic waves directly. That's why the audio signal is modulated with a high-frequency Carrier signal.
Hence, the requirement of the antenna is so high, so, it is impractical to transmit audio signals by electromagnetic waves directly.
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