Figure 18 and cosine forms, of different wavelengths. For this reason.we are compelled to make a special study of waves of thesesimple forms. FORMULA FOR A WAVE 39 … Figure 19 21. Mathematical formula for a wave.—In figure 19; Arepresents a sine-curve, whose equation is y = K.sin 2ttX a B a cosine-curve, whose equation is 2ttX v = K.cos — (1) (2) and C a third curve whose equation is y = K.cofi — (x —a a) (3) Evidently, all three are exactly the same in form,…
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