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Question

The sketch in the figure shows displacement time curve of a sinusoidal wave at x=8 m. Taking velocity of wave v=6m/s along positive x-axis, write the equation of the wave.
776632_056d630da647464ab2147c0acb73ed82.png

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Solution

The equation of any wave is A sin2π(tTxλ).
Here the symbols have their usual meaning.
From the figure and the information, we know that
A=0.5m
T=6s the wave is repeating every 6 seconds
V=6m/s
x=8cm=0.08m
we know that λ=VT=1m/s
The equation now becomes 0.5 sin2π(t60.081)

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