Discussion
Consider the following pairs of wave and typical period.
Acoustic - seconds
Gravity - minutes to hours
Inertial - about a day
Rossby - minutes
How many of the pairs given above are correctly matched?
Answer: D
Rossby waves have periods of days to weeks, being the slowest of the atmospheric wave types, so the last pairing is wrong by several orders of magnitude. The other three are correct. Arranging the wave types by period from seconds to weeks gives a useful ladder against which any new phenomenon can be placed once its timescale is known.
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