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Two sources of sound S 1 and S 2 produce sound waves of same frequency 660 Hz. A listener is moving from source S 1 towards S 2 with a constant speed u m/s and he hears 10 beats/s. The velocity of sound is 330 m/s. Then, u equals :

1. 10.0 m/s
2. 5.5 m/s
3. 15.0 m/s
4. 2.5 m/s

Correct answer: 2.5 m/s

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