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(D) Low frequency signals possess very low energy; hence,they cannot be transmitted over long distances without modulation.In modulation,the character

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carrier waves generated at higher frequencies can be transmitted over long distances.

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(D) Low frequency signals possess very low energy; hence,they cannot be transmitted over long distances without modulation.In modulation,the characteristics of a carrier wave are varied according to the amplitude of the low-frequency (message) signal.Carrier waves are high-frequency signals that are used to transmit low-frequency signals over long distances through the process of modulation.

List-$I$ (Signal)	List-$II$ (Bandwidth)
$i$. Speech Signal	$a$. $4.2 \text{ MHz}$
$ii$. Music Signal	$b$. $6 \text{ MHz}$
$iii$. Video Signal	$c$. $20 \text{ kHz}$
$iv$. $T$.$V$. Signal	$d$. $2.8 \text{ kHz}$

Carrier waves are used for communicating signals over long distances because:

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Match the following:
List-$I$ (Signal) List-$II$ (Bandwidth)
$i$. Speech Signal $a$. $4.2 \text{ MHz}$
$ii$. Music Signal $b$. $6 \text{ MHz}$
$iii$. Video Signal $c$. $20 \text{ kHz}$
$iv$. $T$.$V$. Signal $d$. $2.8 \text{ kHz}$

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