energy - Sound transfers e__________, vibrations - To make a sound there must be v_____________, rarefactions - Low pressure parts of a sound wave are called r__________, compressions - High pressure parts of a sound wave are called c__________, loudspeaker - This converts changing potential difference into a sound wave. L____________, diaphragm - Which part of the loudspeaker makes the air particles move? D_______, ultrasound - U__________ has frequencies higher than human hearing., echolocation - Bats use this to navigate in the dark. e____________, frequency - F_________ is the number of waves which pass a point in a second., amplitude - A________ is the height of a wave measured from rest.,

Sound Waves

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