For transmission of e.m. wave of audible freq | vedclass

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(D) Audible frequency waves have very low frequencies and cannot be transmitted over long distances directly because they require antennas of impracti

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radio-frequency

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(D) Audible frequency waves have very low frequencies and cannot be transmitted over long distances directly because they require antennas of impractical sizes and suffer from high attenuation.To transmit these signals,they are superimposed (modulated) onto high-frequency carrier waves.Radio-frequency waves are ideal for this purpose because they have short wavelengths (on the order of $100\, m$) and high energy,allowing them to travel long distances through space.Therefore,e.m. waves of audible frequency are superimposed with radio-frequency waves.

For transmission of e.m. wave of audible frequency,these waves are superimposed with waves of

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