Question: Because sound is a wave, its possible to make a diffraction grating for sound from a large board of sound-absorbing material with several parallel slits

Because sound is a wave, it’s possible to make a diffraction grating for sound from a large board of sound-absorbing material with several parallel slits cut for sound to go through. When 10 kHz sound waves pass through such a grating, listeners 10 m from the grating report “loud spots” 1.4 m on both sides of center. What is the spacing between the slits? Use 340 m/s for the speed of sound.

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