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