The following two frequencies (f1 and f2 ) are related
to ionospheric sky wave propagation :
f1 = 17 MHz , f2 = 5 MHz. One of them is the maximum frequency returned by the
ionosphere when the waves are transmitted vertically upwards, and the other is the
maximum frequency returned by the ionosphere at zero take-off angle. Name these two
frequencies f1 and f2 . Also calculate the height of the F layer for these pair of frequencies.
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