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Expression for Standing Waves

Two identical...

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Two identical point sources P and Q vibrating in phase with the same amplitude generate sinusoidal waves on a water surface.The sources are 6.5 cm apart. Two nearest points (from P) of destructive interference along PQ are found to be at 0.7 cm and 2.4 cm from P. The total number of points of destructive interference on the line segment PQ is (A) 4 (B) 3 (D)5 (C) 2

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Q. Two radio stations that are 250 m apart emit sound waves of wavelength 100 m. Point A is 400 m from both station. Point B is 450m from both stations. Point C is 400 m from station

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