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Loop lenght of a standing wave is 6cm. What is the phase difference between the two points separated by a distance of 2cm 1) 120 2) 180 3) 0 4) Either 0 or 180

Loop lenght of a standing wave is 6cm. What is the phase difference between the two points separated by a distance of 2cm
1)  120 
2)  180
3) 0
4) Either 0 or 180

Grade:11

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