A) Sky waves are not used in long distance communication
B) Their propagation takes place by total internal reflection
C) Sky waves support the so-called AM band
D) The frequency of sky waves ranges typically from 3 MHz to 30 MHz
Correct Answer: A
Solution :
In the MHz frequency range from a few MHz upto 30 to 40 MHz, long distance communication can be achieved by ionospheric reflection of radio waves back towards the earth. This mode of propagation is called sky wave propagation.
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