Acoustic side hole

The sound wave enters the tube from the left hole and is divided into two waves of the same frequency and the phase difference is fixed. If the wave path difference is an even multiple of half wavelength, the interference phase is long. If the wave path difference is an odd multiple of half wavelength, the interference cancels. Therefore, the distance of the two trains of waves differs by half a wavelength (odd times), and the amplitude of the sound wave here decreases. If the PROPAGATION distance DIFFERS BY one wavelength (an even multiple OF half wavelength), the amplitude of the sound wave increases here.

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