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A sinusoidal wave having wavelength of 6...

A sinusoidal wave having wavelength of `6 m` propagates along positive `x` direction on a string. The displacement `(y)` of a particle at `x = 2 m` varies with time `(t)` as shown in the graph
(a) Write the equation of the wave
(b) Draw y versus x graph for the wave at `t = 0`

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The correct Answer is:
(a) `y=(3 mm)sin (pi/3 x-pi/2 t+pi/3)`
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