I guess the correct word should be <u>compression</u> instead of <u>comprehension.</u>
<em>In sound waves, the distance between </em><u><em>compressions</em></u><em> is called </em><em>the wavelength</em><em>.</em>
<u>A sound wave is a typical example of a longitudinal wave that usually consists of a region where the wave particles are closest together - also known as the compression region - and a region where the wave particles are furthest apart, the rarefaction region</u>. The distance between one compression or rarefaction and the next is the wavelength of the wave.
