Posted by Sharon on Thursday, April 12, 2012 at 4:32pm.
A wavelength
Perhaps you need the Greek letter, Lambda
The question is poorly worded. For a planar wavefront, adjacent molecules in the same wave, in a direction perpendicular to wave travel, have the same displacement and direction.
So the wavelength is not the minimum distance between such particles or molecules.
Nevertheless, they are probably expecting the answer given by Damon.
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