Electromagnetic waves | Physics | Khan Academy

Courses on Khan Academy are always 100% free. Start practicing—and saving your progress—now: https://www.khanacademy.org/science/highschool-physics/x6679aa2c65c01e53:electromagnetic-radiation/x6679aa2c65c01e53:wave-behaviors-of-em-radiation/e/apply-electromagnetic-waves Want to explore more? Check out the full electromagnetic radiation playlist here: https://www.youtube.com/playlist?list=PLSQl0a2vh4HD2AZcy7Pe8mHAiO5UG2WKt Electromagnetic (EM) waves are produced whenever electrons or other charged particles accelerate. The wavelength of an EM wave is the distance between consecutive points on the wave with the same phase (e.g. one crest to the next crest). The frequency of an EM wave is how many wave cycles are emitted, or pass a given point, per second. The speed of a wave is equal to its frequency times its wavelength. In vacuum, all EM waves travel at speed c = 3 x 10^8 m/s. Sections: 00:00 - Intro 00:19 - What is an EM wave? 00:46 - How are EM waves created? 02:15 - Amplitude and phase 04:26 - Wavelength and frequency 06:00 - Wave speed 08:01 - Speed of EM waves in vacuum 09:09 - The EM spectrum 10:26 - Analog modulation 12:58 - Digital modulation ------------------ 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