Science and myths's video: number 21 why 21cm magic length of universe

In our Universe, quantum transitions are the governing rule behind every nuclear, atomic, and molecular phenomenon. Unlike the planets in our Solar System, which could stably orbit the Sun at any distance if they possessed the right speed, the protons, neutrons, and electrons that make up all the conventional matter we know of can only bind together in a specific set of configurations. These possibilities, although numerous, are finite in number, as the quantum rules that govern electromagnetism and the nuclear forces restrict how atomic nuclei and the electrons that orbit them can arrange themselves. In all the Universe, the most common atom of all is hydrogen, with just one proton and one electron. Wherever new stars form, hydrogen atoms become ionized, becoming neutral again if those free electrons can find their way back to a free proton. Although the electrons will typically cascade down the allowed energy levels into the ground state, that normally produces only a specific set of infrared, visible, and ultraviolet light. But more importantly, there’s a special transition that occurs in hydrogen that produces light of about the size of your hand: 21 centimeters (about 8¼”) in wavelength. That’s a magic length, and it just might someday unlock the darkest secrets hiding out in the recesses of the Universe. When it comes to the light in the Universe, wavelength is the one property that you can count on to reveal how that light was created. Even though light comes to us in the form of photons individual quanta that, collectively, make up the phenomenon we know as light there are two very different classes of quantum process that creates the light that surrounds us: continuous ones and discrete ones. A continuous process is something like the light emitted by the photosphere of the Sun. It’s a dark object that’s been heated up to a certain temperature, and it radiates light of all different, continuous wavelengths as dictated by that temperature: what physicists know as blackbody radiation.A discrete process, however, doesn’t emit light of a continuous set of wavelengths, but rather only at extremely specific wavelengths. A good example of that is the light absorbed by the neutral atoms present within the extreme outer layers of the Sun. As the blackbody radiation strikes those neutral atoms, a few of those photons will have just the right wavelengths to be absorbed by the electrons within the neutral atoms they encounter. When we break sunlight up into its individual wavelengths, the various absorption lines present against the backdrop of continuous, blackbody radiation reveal both of these processes to us. Astrax event----- https://astrax.iitmandi.co.in/ Regestration Link-- https://astrax.iitmandi.co.in/event/ Now to know more watch out this full video till the end. Thanks for watching.. Social accounts link Instagram- https://www.instagram.com/scienceandmyths/ Facebook Page- https://www.facebook.com/ScienceAndMyths/ जानिए क्यों इतना अनोखा है number 21 | why 21cm magic length of universe FAIR-USE COPYRIGHT DISCLAIMER This video is meant for Educational/Inspirational purpose only. We do not own any copyrights, all the rights go to their respective owners. The sole purpose of this video is to inspire, empower and educate the viewers.