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
E) (e) The signal is not a radio signal
Correct Answer: E
Solution :
Following are the problems which are faced while transmitting audio signals directly. (i) These signals are relatively of short range. (ii) If everybody 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 75 km.
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