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The maximum possible frequency for which the wave is reflected back for a given distance of propagation in the ionosphere layer is called as_______

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The maximum possible frequency for which the wave is reflected back for a given distance of propagation in the ionosphere layer is called as_______

(a) Maximum usable frequency

(b) Critical frequency

(c) Resonance frequency

(d) Dominating frequency

I got this question by my college professor while I was bunking the class.

Query is from Maximum Usable Frequency in portion Virtual Height, Critical Frequency and Muf of Antennas

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Correct choice is (a) Maximum usable frequency

To elaborate: The maximum possible frequency for which the wave is reflected back for a given distance of propagation in the ionosphere layer is called as maximum usable frequency (MUF). For a specified angle there will be a maximum frequency for which the wave is reflected back. If wave exceeds MUF then it’s not reflected back.

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