Answer:
Sky wave propagation can be used by short wave broadcast services having frequency range from a few MHz to\[\text{3}0\text{ MHz}\]. In sky wave propagation, a radiowave is directed towards the sky and is reflected by the ionosphere towards the desired location of the earth, as shown in Fig. In this way, radiowaves can travel very large distances and can even bend round the earth. Sky wave propagation is restricted to frequencies up to 30 MHz because ionosphere cannot reflect e.m. radiations having frequencies greater than\[\text{3}0\text{ MHz}\].
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