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 \[3\text{ }MHz\]to \[30\text{ }MHz\]
Correct Answer: A
Solution :
In the MHz frequency range from a few MHz upto 30 to \[40\text{ }MHz,\] long distance communication can be achieved by ionosphere reflection of radio waves back towards the earth. This mode of propagation is called sky wave propagation.
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