Audio signal cannot be transmitted because

Options

A. The signal has more noise
B. The signal cannot be amplified for distance communication
C. The transmitting antenna length is very small to depracticable
D. The signal is not a radio signal

Answer

d

Explanation

Following are the problems which are face while transmitting audio signal directly.
`(i)` These signal are relatively of short range.
`(ii)` If every body started transmitting these low frequency signals directly, mutual interference will render all of them ineffective.
`(iii)` Size of antenna required for their efficient radiation would be larger `i.e.`, about `75km`.