Discussion
Consider the following pairs of wave and restoring force.
Acoustic - compressibility
Gravity - buoyancy
Rossby - potential vorticity gradient
Kelvin - friction
How many of the pairs given above are correctly matched?
Answer: C
The Kelvin wave is a gravity wave restored by buoyancy and trapped by rotation against a boundary or the equator, so friction plays no part in it whatever. The other three pairings are correct. Friction damps waves rather than restoring them, and no atmospheric wave type has friction as its restoring mechanism.
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