(4-4) y1 = y2, so y1 + y2 = 2y1 = 2 Asin(2π(x-vt)/λ)
So the wave has the same wavelength and phase as the original but twice the amplitude. Graphically:
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(4-4) y1 = y2, so y1 + y2 = 2y1 = 2 Asin(2π(x-vt)/λ)
So the wave has the same wavelength and phase as the original but twice the amplitude. Graphically:
This is constructive interference.