Four waves are described by the following equations, in which all distances are measured in centimeters and all times are measuredin seconds:
yA = 1.0 cos(3x − 4t)
yB = 10 cos(5x + 4t)
yC = 20 cos(−10x + 60t)
yD = 20 cos(−4x − 20t)
(a) Which of these waves travel in the +x direction? (b) Which of these waves travel in the − x direction? (c) Which wave has the highestfrequency? (d) Which wave has the greatest wavelength? (e) Which wave has the greatest speed?
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