Electromagnetic waves and matter | 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 Electromagnetic (light) waves travel along straight line paths. We can model these paths using rays. When a light ray encounters a boundary between different materials, the light can be reflected, absorbed, and/or transmitted. Most everyday objects don't emit their own visible light. We see these objects when visible light from a source reflects off of the object and into our eyes. Objects that absorb all colors of visible light appear black. Sections: 00:00 - Intro 00:30 - EM waves and the ray model 01:38 - Reflection 02:43 - Absorption 04:06 - Transmission 06:19 - X-ray imaging 07:21 - Summary ------------------ 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