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G3C02:What is meant by the term “critical frequency” at a given incidence angle?

G3C02G3C

What is meant by the term “critical frequency” at a given incidence angle?

Direct answer summary (2023-2027 NCVEC pool)

The official correct answer for G3C02 is The highest frequency which is refracted back to Earth.

The key fact is The highest frequency which is refracted back to Earth. 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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More questions in G3C

G3C01Which ionospheric region is closest to the surface of Earth?G3C03Why is skip propagation via the F2 region longer than that via the other ionospheric regions?G3C04What does the term “critical angle” mean, as applied to radio wave propagation?G3C05Why is long-distance communication on the 40-, 60-, 80-, and 160-meter bands more difficult during the day?G3C06What is a characteristic of HF scatter?G3C07What makes HF scatter signals often sound distorted?