Sound waves | Middle school physics | Khan Academy

Courses on Khan Academy are always 100% free. Start practicing—and saving your progress—now: https://www.khanacademy.org/science/ms-physics Want to explore more? Check out the full middle school physics playlist here: https://www.youtube.com/playlist?list=PLSQl0a2vh4HC-daPugvP8kL_zuE3u_3Zr 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 ------------------ Khan Academy is a nonprofit organization with the mission of providing a free, world-class education for anyone, anywhere. Khan Academy has been translated into dozens of languages, and 15 million people around the globe learn on Khan Academy every month. As a 501(c)(3) nonprofit organization, we would love your help! Donate here: https://www.khanacademy.org/donate?utm_source=youtube&utm_medium=desc Volunteer here: https://www.khanacademy.org/contribute?utm_source=youtube&utm_medium=desc 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