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G3C04:What does the term “critical angle” mean, as applied to radio wave propagation?

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What does the term “critical angle” mean, as applied to radio wave propagation?

Direct answer summary (2023-2027 NCVEC pool)

The official correct answer for G3C04 is The highest takeoff angle that will return a radio wave to Earth under specific ionospheric conditions.

The key fact is The highest takeoff angle that will return a radio wave to Earth under specific ionospheric conditions. Match that fact to the exact condition in the question; the other choices describe a different rule, band, component, or operating situation.

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