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S(1): The particles speed can never be e...

`S_(1)`: The particles speed can never be equal to the wave speed in sine wave if the amplitude is less then wavelength divided by `2pi`.
`S_(2)`: In transverse wave of amplitude A, the maximum particle velocity is four times its wave velocity. Then, the wave length of the wave is `piA`
`S_(3)`: the phase difference between two points separated by 1m in a wave of frequency 120 Hz is `90^(@)`. the velocity of the wave is 480 m/s

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