The speed of sound is 343 ms. a sound wave of frequency, Ask an Expert

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The speed of sound is 343 m/s. A sound wave of frequency 5,700 Hz from a distant source strikes a very high fence of total length 20 m with 2.0 cm wide vertical gaps spaced 1.0 cm apart. At what angle (in degrees) is the third-order (m=3) maximum located?

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