Question

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Answer 1

Path difference Delta = lambda pi/2pi

1 = lambda/2pi) * (pi/2)

lambda = 4 m

Hence

V = 120*4 = 480 m/sec.

Answer 2

Path difference \Delta = \lambda \phi/2\pi

1 = (\lambda/2\pi) * (\pi/2)

\lambda = 4 m

Hence

V = n* \lambda = 120*4 = 480 m/sec.

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