For sky wave propagation, the radio waves must have a frequency range in between (a) \( 45 \math...

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For sky wave propagation, the radio waves must have a frequency range in between
(a) \( 45 \mathrm{MHz} \) to \( 50 \mathrm{MHz} \)
(b) \( 5 \mathrm{MHz} \) to \( 25 \mathrm{MHz} \)
(c) \( 35 \mathrm{MHz} \) to \( 40 \mathrm{MHz} \)
(d) \( 1 \mathrm{MHz} \) to \( 2 \mathrm{MHz} \)
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