An audio signal of 15 kHz frequency cannot be transmitted directly over long distances without modulation because:

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Mathematics · Communication Systems

Verified Solution4 OptionsUpdated: October 2026👁️1 View

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the size of the required antenna (λ/4) would be at least 5 km, which is practically unfeasible.

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Answer 1

the velocity of propagation of an audio frequency wave is much less than the speed of light.

Answer 2

the size of the required antenna would be at least 20 km, which is not convenient.

Answer 3

the audio signal cannot be transmitted through sky waves under any circumstances.

Answer 4

the size of the required antenna (λ/4) would be at least 5 km, which is practically unfeasible.

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