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Radio waves at Medium Frequency wavelengths propagate via ___________

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Radio waves at Medium Frequency wavelengths propagate via ___________

(a) Ground waves

(b) Air waves

(c) Sky waves

(d) Electric waves

The question was posed to me in unit test.

This interesting question is from Radio Shop topic in section Radio Shop of Aircraft Maintenance

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Correct option is (a) Ground waves

The best I can explain: Radio waves at Medium Frequency wavelengths propagate via ground waves. Ground waves follow the contour of the Earth and travel beyond the visual horizon.

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