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The regions of compressions and rarefractions of sound wave are·establisbed because
the sound wave undergoes diffraction behind obstacles
the reflected sound wave at fixed end interferes with the incident wave
the longitudinal movement of air molecules produce pressure fluctuations
the speed of the sound wave changes as it travels through a medium
-Vibrates longitudinally; the longitudinal movement of air produces pressure fluctuations. Since the particles of the medium vibrate in a longitudinal fashion, compressions and rarefactions are created.
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