Millikan, Robert Andrews, Gale, Henry Gordon · Boston : Ginn and Co. · leaf 375
when the latter reaches C, all the airbetween C and some point c (Fig. 344) one-half wave lengthaway is crowding forward and is therefore in a state of com-pression, or condensation. Again, as the prong moves back fromC to A, since it tends to leave a vacuum behind it, the adja-cent layer of air… … is therefore iii a state of diminished density, or rarefaction.During this time the preceding forward motion has advancedone half wave length to the right, so that it now occupies theregion between c and a (Fig. 344). Hence at the end of onecomplete vibration of the prong we may divide the air…
Physics
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