https://www.khanacademy.org/science/cambridge-o-level-physics-cie/x0e04e0cb682fb793:electromagnetic-spectrum/x0e04e0cb682fb793:uses-of-electromagnetic-waves/v/electromagnetic_waves 2024-05-16T01:13:56.718395588Z Electromagnetic waves 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. Mahesh Shenoy video https://cdn.kastatic.org/ka_thumbnails_cache/fa27a4a6-9f11-4533-8d14-5569e37dfdff_1280_720_base.png Electromagnetic waves 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. https://cdn.kastatic.org/ka-youtube-converted/Je_f4RimfKI.mp4/Je_f4RimfKI.mp4 853 Uses of Electromagnetic waves https://www.khanacademy.org/science/cambridge-o-level-physics-cie/x0e04e0cb682fb793:electromagnetic-spectrum/x0e04e0cb682fb793:uses-of-electromagnetic-waves/v/tour-of-the-ems-02-radio-waves 2020-06-23T07:22:42Z Radio waves (1888) NASA video https://cdn.kastatic.org/googleusercontent/A5ACZMYyVkUak16wXY1FuXYegPNG7O9-uMpBhNDiu-888zly-E20ypCrCZzM6Fy45cfIx4ijIVBnR4Ri_QEx0pkD Radio waves (1888) https://cdn.kastatic.org/ka-youtube-converted/OzDmEA8x0nQ.mp4/OzDmEA8x0nQ.mp4 219 Uses of Electromagnetic waves https://www.khanacademy.org/science/cambridge-o-level-physics-cie/x0e04e0cb682fb793:electromagnetic-spectrum/x0e04e0cb682fb793:uses-of-electromagnetic-waves/v/microwaves 2020-06-23T07:22:41Z Microwaves (1930) NASA video https://cdn.kastatic.org/googleusercontent/dpnF1GzKihDefExUBhHxeFWg9t5olYoxMRL-5Rq7ioxohb1Rae7ys20bHSb_uMSP2kN7Cd8_t3TlZerrraMWVA8 Microwaves (1930) https://cdn.kastatic.org/ka-youtube-converted/UZeBzTI5Omk.mp4/UZeBzTI5Omk.mp4 184 Uses of Electromagnetic waves https://www.khanacademy.org/science/cambridge-o-level-physics-cie/x0e04e0cb682fb793:electromagnetic-spectrum/x0e04e0cb682fb793:uses-of-electromagnetic-waves/v/infrared-waves 2020-06-23T07:22:42Z Infrared waves (1800) NASA video https://cdn.kastatic.org/googleusercontent/b9RykjIGb8SLuKd49X4zqRcV-4mC_69vV8ZZcTrjaUEdbsVJc_ZjRpEG0ZawUhhSQN8QzFxII_MDXoiIh9-GAMo Infrared waves (1800) https://cdn.kastatic.org/ka-youtube-converted/i8caGm9Fmh0.mp4/i8caGm9Fmh0.mp4 323 Uses of Electromagnetic waves https://www.khanacademy.org/science/cambridge-o-level-physics-cie/x0e04e0cb682fb793:electromagnetic-spectrum/x0e04e0cb682fb793:uses-of-electromagnetic-waves/v/visible-light-waves 2020-06-23T07:22:40Z Visible light (1672) NASA video https://cdn.kastatic.org/googleusercontent/mIE2fNoGNAZk5FP1lw67Ne8HJ51EYDNMdpWjnLpI3IsVgGquUfz6G1dvORa9-uRJtkBjYm3svOcgVA69Ll_fWYbAaA Visible light (1672) https://cdn.kastatic.org/ka-youtube-converted/PMtC34pzKGc.mp4/PMtC34pzKGc.mp4 290 Uses of Electromagnetic waves https://www.khanacademy.org/science/cambridge-o-level-physics-cie/x0e04e0cb682fb793:electromagnetic-spectrum/x0e04e0cb682fb793:uses-of-electromagnetic-waves/v/tour-of-the-ems-06-ultraviolet-waves 2020-06-23T07:22:42Z Ultraviolet waves (1801) NASA video https://cdn.kastatic.org/googleusercontent/duKsfU_8KbzbUjJFKg5OqzlBOSBTX7sP5lVAtuG8S4ahHYaNZNGTtNkcKxxhr7t-bkGvutGz3RJfV5YoysKKS9lQqQ Ultraviolet waves (1801) https://cdn.kastatic.org/ka-youtube-converted/QW5zeVy8aE0.mp4/QW5zeVy8aE0.mp4 220 Uses of Electromagnetic waves https://www.khanacademy.org/science/cambridge-o-level-physics-cie/x0e04e0cb682fb793:electromagnetic-spectrum/x0e04e0cb682fb793:uses-of-electromagnetic-waves/v/x-rays 2020-06-23T07:22:41Z X-rays (1895) NASA video https://cdn.kastatic.org/googleusercontent/xOCnLhhnlvvIG3i670bCEgmuJtaRnPnEFRW2LpAE99GkV4T7bgum6WqsG2B0nJHKq1YVMAFev7799ypJ2_2RlGU X-rays (1895) https://cdn.kastatic.org/ka-youtube-converted/CCAYcuCWOnM.mp4/CCAYcuCWOnM.mp4 170 Uses of Electromagnetic waves https://www.khanacademy.org/science/cambridge-o-level-physics-cie/x0e04e0cb682fb793:electromagnetic-spectrum/x0e04e0cb682fb793:uses-of-electromagnetic-waves/v/gamma-waves 2020-06-23T07:22:41Z Gamma waves (1900) NASA video https://cdn.kastatic.org/googleusercontent/m5sv5hYJ4YoM0PW92dvj9ppMaaba_NSmH0TPCnQwXblHDywo57OWksjma_SdYdVRg1BHmriFLa7JywpyZngbfQKJ Gamma waves (1900) https://cdn.kastatic.org/ka-youtube-converted/TA5SLDiIUWs.mp4/TA5SLDiIUWs.mp4 222 Uses of Electromagnetic waves https://www.khanacademy.org/science/cambridge-o-level-physics-cie/x0e04e0cb682fb793:electromagnetic-spectrum/x0e04e0cb682fb793:uses-of-electromagnetic-waves/v/why-is-the-sky-blue-ur 2025-08-08T00:24:37.843818748Z Why is the sky blue? Created by Khan Academy video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Why is the sky blue? Created by Khan Academy https://cdn.kastatic.org/ka-youtube-converted/vETlrH-Xguk.mp4/vETlrH-Xguk.mp4 606 Uses of Electromagnetic waves