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A wave having an amplitude of 3cm is to be superimposed with another wave of the same amplitude. What should be their phase difference if the net amplitude has to be 0?

A wave having an amplitude of 3cm is to be superimposed with another wave of the same amplitude. What should be their phase difference if the net amplitude has to be 0? Correct Answer π

The net amplitude is given by: A2 = A12 + A22 + 2A1A2cosθ, where θ is the phase difference. For A to be zero 9 + 9 + 2(9)(9)cosθ = 0 ∴ θ = π.

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