Discussion
Which period corresponds to that frequency in the troposphere?
Answer: C
With a buoyancy frequency near 0.01 per second the period is about 600 seconds, so internal gravity waves in the troposphere have periods of ten minutes and upward. In the more strongly stratified stratosphere the period shortens to about five minutes. The inertial period of seventeen hours belongs to the rotational rather than the buoyancy restoring mechanism. Reading the definition literally, rather than recalling a formula, is the reliable route through questions of this shape.
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