Discussion
Statement I: Gravity waves are restored by buoyancy.
Statement II: Rossby waves are restored by the potential vorticity gradient.
In the light of the above statements, choose the correct answer.
Answer: C
Both statements correctly identify the restoring mechanism of their respective wave types. Classifying atmospheric waves by what pushes a displaced parcel back is the most reliable organising principle for the whole family, since the dispersion relation of each follows from the physics of its restoring force. Sound waves complete the set, being restored by compressibility.
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