Sound transmission through cracks and gaps occurs due to the pressure difference between two spaces. When a sound wave hits a surface, it causes the surface to vibrate. If there is a gap or crack in the surface, these vibrations can travel through the crack, allowing the sound to move from one side to the other. The efficiency of sound transmission through a crack depends on the size of the crack relative to the wavelength of the sound. Generally, smaller cracks can effectively transmit high-frequency sounds, which have shorter wavelengths, while larger cracks are needed for the transmission of low-frequency sounds.

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