Discussion
Which frequency bounds an internal gravity wave from above?
Answer: C
The dispersion relation gives the frequency as the buoyancy frequency times the cosine of the angle the wavenumber vector makes with the vertical, so no internal gravity wave can exceed the buoyancy frequency. In the troposphere that corresponds to a period of about ten minutes. The Coriolis parameter bounds the frequency from below once rotation is included, giving the inertia-gravity wave band. Reading the definition literally, rather than recalling a formula, is the reliable route through questions of this shape.
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