Audio signals cannot be transmitted directly | vedclass

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(D) The correct option is $D$.Following are the primary reasons why audio signals (low-frequency signals) cannot be transmitted directly over long dis

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The required transmitting antenna length is very large and impracticable.

Vedclass · Answer

(D) The correct option is $D$.Following are the primary reasons why audio signals (low-frequency signals) cannot be transmitted directly over long distances:$(i)$ These signals have a very low frequency, which results in a very large wavelength $(\lambda = c/f)$.$(ii)$ For efficient radiation and reception, the antenna size should be at least $\lambda/4$. For an audio frequency of $20 	ext{ Hz}$, the required antenna length would be approximately $3750 	ext{ km}$, which is physically impracticable.$(iii)$ If multiple users transmit low-frequency signals directly, they would interfere with each other, making communication ineffective.$(iv)$ Therefore, modulation is required to shift the signal to a higher frequency, allowing for a much smaller and practical antenna size.

Audio signals cannot be transmitted directly over long distances because:

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