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A submarine A travelling at 18 km h is being chased along the line of...

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A submarine A travelling at 18 km h is being chased along the line of its velocity by another submarine B travelling at 27 km h B sends a sonar signal of 500 Hz to detect A and receives a reflected sound of frequency v The value of v is close to Speed of sound in water 1500 ms 2019 Main 12 April I a 504 Hz b 507 Hz c 499 Hz d 502 Hz

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