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Past exam of the mathematics course of the University of Cambridge 2024 ii Paper 3 39D b v Solution Created 2026-09-24 Updated 2026-09-25
The mountain-wave cutoff follows because the hills force intrinsic frequency , whereas internal gravity waves require . Thus separates long hills, which radiate vertically propagating waves and carry energy upward, from short hills, whose response is evanescent and carries no mean vertical energy flux.