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Statement of a problem № 2797

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The two sound sources in Fig. 23-1 vibrate in-phase. A loud sound is heard at P when L1 = L2. As L1 is slowly increased, the weakest sound is heard when L1 - L2 has the values 20.0 cm, 60.0 cm, and 100 cm. What is the frequency of the sound source if the speed of sound is 340 m/s?

Solution:
The two sound sources in Fig. 23-1 vibrate in-phase. A loud sound is heard at P

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