Discussion
Which wavelength grows fastest according to observation and theory?
Answer: D
Both the Eady and two-level models give a most unstable wavelength near 4000 kilometres, which agrees well with the observed spacing of mid-latitude cyclones. That agreement is what established the theory. The deformation radius, at about 1000 kilometres, sets the scale but the most unstable wavelength is several times larger, so quoting one for the other is a common slip.
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