Discussion
The distance between the centre of a compression and an adjacent rarefaction is equal to _________.
Answer: A
The distance between the centre of a compression and the centre of the adjacent rarefaction is half the wavelength. A wavelength is the distance between two successive compressions (or two successive rarefactions), and a rarefaction lies midway between two compressions.
Twice the wavelength, the wavelength itself and one-third of the wavelength do not match that geometry.
A wavelength is the full distance between two compressions, so the point midway between them is a rarefaction, half a wavelength away.
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