An audio signal of \( 15 \mathrm{kHz} \) frequency cannot be transm...

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