Sound waves | Middle school physics | Khan Academy

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Sound is a compression wave. Sound waves require a matter medium (solid, liquid, or gas) to travel through, and cannot travel through vacuum. The amplitude of a sound wave corresponds to its loudness. The frequency of a sound wave corresponds to its pitch. The speed of a sound wave depends on the medium its traveling through. Sound waves exhibit wave behaviors like reflection, which are useful in a variety of applications.

Sections:
00:00 - Intro
00:27 - Sound is wave
01:43 - How does a sound wave propagate?
03:04 - Sound wave simulation
04:00 - Amplitude, frequency, and speed
07:34 - Reflection and echoes
08:03 - Ultrasound imaging

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Waves intro (https://phet.colorado.edu/en/simulations/waves-intro) by PhET Interactive Simulations, University of Colorado Boulder, CC BY 4.0

Sound waves (https://phet.colorado.edu/en/simulations/sound-waves) by PhET Interactive Simulations, University of Colorado Boulder, CC BY 4.0
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https://www.youtube.com/watch?v=9u1PjsBfrmg
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