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Distance at which a sky wave is received back on earth ________ with an angle of incidence.

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Distance at which a sky wave is received back on earth ________ with an angle of incidence.

(a) increases

(b) decreases

(c) can be increase or decrease

(d) can neither be increase or decrease

I have been asked this question by my college professor while I was bunking the class.

This question is from Costas Loop topic in portion Double Sideband Suppressed Carrier Modulation of Analog Communications

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The correct choice is (b) decreases

The best I can explain: The distance at which a sky wave is received back on earth is inversely proportional to the angle of incidence. Thus, the distance at which a sky wave is received back on earth decreases with an angle of incidence.

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