A) Radio waves in the frequency range 30 MHz to 60 MHz are called sky waves
B) Radio horizon of the transmitting antenna for space wave is\[{{d}_{T}}=\sqrt{(2R{{h}_{T}})}\] (R = radius of earth,\[{{h}_{T}}=\]height of transmitting antenna)
C) Within the skip distance neither the ground waves nor the sky waves are received
D) The principle of fibre optical communication is total internal reflection
E) Fibre optical communication is free from electrical disturbances
Correct Answer: A
Solution :
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