Discussion
Which restoring force acts on an internal gravity wave?
Answer: B
A parcel displaced upward in a stably stratified atmosphere becomes denser than its surroundings and sinks back, overshooting and oscillating at the buoyancy frequency. That oscillation propagating through the fluid is an internal gravity wave. Compressibility gives sound waves, the latitudinal variation of the Coriolis parameter gives Rossby waves, and friction damps waves rather than restoring them. Checking the units of each quantity catches a wrong formula before the arithmetic begins.
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