An audio signal of \( 15 \mathrm{kHz} \) frequency cannot be transmitted over long distances wit....

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An audio signal of \( 15 \mathrm{kHz} \) frequency cannot be transmitted over long distances without modulation because
(1) the size of the required antenna would be at least \( 5 \mathrm{~km} \) which is not convenient.
(2) the audio signal can not be transmitted through sky waves.
(3) the size of the required antenna would be at least \( 20 \mathrm{~km} \), which is not convenient.
(4) effective power transmitted would be very low, if the size of the antenna is less than \( 5 \mathrm{~km} \).


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