Check my other channel Geographics: https://www.youtube.com/channel/→→Subscribe for new videos every day! https://www.youtube.com/user/TodayIFoundOut?sub_confirmation=1 Follow Simon on social media: https://twitter.com/SimonWhistler https://www.instagram.com/simonwhistler/ Never run out of things to say at the water cooler with TodayIFoundOut! Brand new videos 7 days a week! More from TodayIFoundOut: The Fruit That Tastes Like Chocolate Pudding, Is White Chocolate Actually Chocolate, and Much More https://youtu.be/Owvyq93M00Y What's the Difference Between a Pony and a Horse, and a Donkey and a Mule? https://youtu.be/U5Jh-jBlNoM In this video: Comprised of a sealed tube coated on the inside with a phosphor powder and filled with (usually) argon and a tiny bit of mercury, the way in which fluorescent bulbs produce light is extremely fascinating. Want the text version?: http://www.todayifoundout.com/index.php/2015/10/fluorescent-lights-noisy/ Sources: http://donklipstein.com/f-lamp.html http://www.physics4kids.com/files/elec_ac.html http://www.coolmagnetman.com/magelect.htm https://www.reddit.com/r/explainlikeimfive/comments/2mk4wc/eli5_why_do_fluorescent_lights_make_noise_when/ http://www.standardpro.com/ballasts-info/fluorescent-ballasts/faq#noise-and-ballasts http://www.improvenet.com/a/how-can-i-stop-my-fluorescent-lights-from-buzzing http://energy.gov/articles/history-light-bulb http://electronics.stackexchange.com/questions/61547/negative-and-positive-cycle-of-ac-current-half-wave-rectification-and-full-wave http://articles.latimes.com/2001/may/19/home/hm-29 http://www.todayifoundout.com/index.php/2012/06/how-black-lights-make-things-glow/ https://www.youtube.com/watch?v=DfNFr-F5eUU https://en.wikipedia.org/wiki/Magnetostriction http://www.straightdope.com/columns/read/2110/why-do-fluorescent-lights-buzz