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Sketch two periods of a cosine wave, y(x,t) travelling in the x-direction Make sure that your...

Sketch two periods of a cosine wave, y(x,t) travelling in the x-direction Make sure that your axes are labelled. Let y(x=0,t) = +A.Annotate the sketch with: the amplitudes, +A and –A; the wavelength λ; the direction of travel (labeled with velocity, ‘v’); ‘crest’; ‘trough’. Point with arrows and label the points
along the graph that are: i) in phase with y(x=0,t) and, ii) 180 degrees out of phase with y(x=0,t)
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Crest A -A+ trough iIn phase with , t) ie la)is (c) i)120 out of phase with (a) iare (d)

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