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Two waves with the same frequency have amplitudes 1 cm and 3 cm.

What is the amplitude of the in phase superposition (in cm)? What is the amplitude of the 180  out of phase superposition (in cm)?
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Added Tue, 04 Aug '15
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Amplitudes simply add linearly. Or at least i know for certain they do when superimposed which i believe is essentially superposition

A. Maximum reinforcement occurs at zero phase difference meaning 0 degrees.
A = A1+A2 = 4 cm.
B. Minimum reinforcement occurs at 2pi or 180 deg phase difference.
A = A1-A2 = -2 cm.
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