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# Which of the following frequency will be suitable for beyond the horizon communication using sky waves?

$\begin{array}{1 1}(a)\;\text{10 KHz}\\(b)\; \text{10 MHz}\\(c)\;\text{1 GHz}\\(d)\;\text{1000 GHz}\end{array}$

10 MHz frequency will be suitable for beyond the horizon communication using skywaves.
10 KHz,cannot be transmitted because of antenna size.1 and 1000 GHz are very frequency wave which will penetrate and so cannot be transmitted.
Hence (b) is the correct answer.