Question

Why audio signals cannot be transmitted directly?

(a) The signal has more noise

(b) The signal cannot be amplified for distance communication

(c) The transmitting antenna length is very small to design

(d) The transmitting antenna length is very large and impracticable

The question was asked by my school principal while I was bunking the class.

My question is from Communication Systems in division Communication Systems of Physics – Class 12

Answer 1

The correct choice is (d) The transmitting antenna length is very large and impracticable

The best I can explain: Audio signals require a transmitting antenna of very large and impracticable length. This is because of the high wavelength of the sound waves produced. Therefore, audio signals cannot be transmitted directly.