4 A whistle emits sound waves of frequency 2000 Hz These sound waves reach a...

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4 A whistle emits sound waves of frequency 2000 Hz These sound waves reach a point X through two different path such that path difference is 20 cm and there is silence at this point Y is a successive point at which also there is silence but the path difference is 35 cm Speed of sound is 1 340 m sec 2 300 m sec 3 380 m sec 4 332 m sec

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