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The wave velocity of a progressive wave is 180 ms- and the phase difference between the wo particles seperated by a distance of 12m

The wave velocity of a progressive wave is 180 ms- and the phase difference between the wo particles seperated by a distance of 12m is 1080. The number of waves passing across a point in 1 sec is 1) 120 2) 240 3) 60 4) 360

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