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Can anyone please do AS Physics May/June 2009 Paper 2 Question 5???

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xygoninator:
Hi guys, could u please help me with question 5? im struggling on this question so i wud appreciate ur help. thank you.

astarmathsandphysics:
a)The frequency of S1 and S2 must be equal. S1 and S2 must be 180 degrees out of phase.

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