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12. Two coherent wave sources are at point P and Q respectively. They emit two coherent waves with frequency f, wavelength 1 and the same

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12. Two coherent wave sources are at point P and Q respectively. They emit two coherent waves with frequency f, wavelength 1 and the same initial phase. Assume PQ=31/2 , R is a point on the line PQ. (a) At point R, what is the phase difference of the two waves emitted from P and Q; (b) At point R, what is the resultant amplitude of the interference of the two coher- ent waves

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