A sinusoidal travelling wave in x-direction has amplitude of 15 ππ, wavelength of 40 ππ and the
frequency of 8 π»π§. The vertical displacement at π₯ = 0 and π‘ = 0 is 15 ππ. Find (i) Wave number (ii)
Time period (iii) Wave speed, and (iv) Angular frequency of wave.
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