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Courses on Khan Academy are always 100% free. Start practicing—and saving your progress—now: https://www.khanacademy.org/science/m... Want to explore more? Check out the full middle school physics playlist here: • Middle school physics | Khan Academy Light is an electromagnetic wave. All electromagnetic waves travel at the speed of light in vacuum. The frequency of a light wave corresponds to its color. The amplitude of a light wave corresponds to its brightness. Visible light is only a small part of the electromagnetic spectrum, which also includes radio, microwaves, infrared, ultraviolet, X-rays, and gamma rays. These different frequencies of electromagnetic waves have different applications. Sections: 00:00 - Intro 00:25 - What is light? 01:20 - Light is an electromagnetic wave 04:13 - Frequency is related to color 05:13 - Amplitude is related to brightness 06:02 - The electromagnetic spectrum ------------------ 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?ut... Volunteer here: https://www.khanacademy.org/contribut...