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An audio signal of 15 kHz frequency cann...

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

A

the size of the required antenna would be at least 5 km which is inconvenient

B

the audio signal cannot be transmitted through sky waves

C

the size of the requied antenna would be at least 20 km which is inconvenient

D

effective power transmitted would be very low, if the size of the antenna is less than 5 km

Text Solution

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The correct Answer is:
A, B, D
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