Question: What phase difference between two otherwise identical traveling waves, moving in the same direction along a stretched string, will result in the combined wave having

What phase difference between two otherwise identical traveling waves, moving in the same direction along a stretched string, will result in the combined wave having an amplitude 1.6 times that of the common amplitude of the two combining waves? Express your answer in (a) degrees, (b) radians, and (c) as a fraction of the wavelength.

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