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[" 130.Two waves of frequencies "20Hz" a...

[" 130.Two waves of frequencies "20Hz" and 30"Hz" .Travels out "],[" from a common point.The phase difference between them "],[" after "0.6sec" is : "],[[" (a) zero "," (b) "pi/2],[" (c) "pi," (d) "3 pi/4]]

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