This star almost broke Bohr's atomic model #SoMEpi
11,056
Publicado 2024-07-13
Story of the mysterious spectral lines of Zeta Puppis, a star that seemed to challenge the atomic model proposed by Niels Bohr. In this journey quantum physics meets astronomy, learn how Bohr cleverly solved the issue and turned the that nearly dismantled his revolutionary model into a successful prediction.
[Related videos]
How Niels Bohr created the quantum atom • How Niels Bohr created the quantum atom
Playlist video series on Quantum Physics • Quantum Mechanics
[Affiliate links (may earn a commission)]
∘ D. Sobel , "The Glass Universe: How the Ladies of the Harvard Observatory Took the Measure of the Stars" amzn.to/3WgS80y
[References]
∘ N. Bohr, On the constitution of atoms and molecules, London Edinburgh Philos. Mag. & J. Sci. 26, 151: 1 (1913) archive.org/details/londonedinburg6261913lond/page…
∘ N. Bohr, On the constitution of atoms and molecules (part 2), London Edinburgh Philos. Mag. & J. Sci. 26, 476 (1913) archive.org/details/londonedinburg6261913lond/page…
∘ E. C. Pickering, Stars Having Peculiar Spectra. New Variable Stars in Crux and Cygnus, Harvard College Observatory Circ.12, 1 (1896) ui.adsabs.harvard.edu/abs/1896HarCi..12....1P/abst…
∘ E. C. Pickering, The spectrum of zeta Puppis, ApJ 5, 92 (1897) ui.adsabs.harvard.edu/abs/1897ApJ.....5...92P/abst…
∘ A. Fowler, Observations of the Principal and other Series of Lines in the Spectrum of Hydrogen, MNRAS 73, 2, 62 (1912) doi.org/10.1093/mnras/73.2.62
∘ A. Fowler,Nature 92, 232 (1913) www.nature.com/articles/092232a0
[Credits]
Niels Bohr, public domain
Emission spectrum, by Almuazi under CC BY-SA 4.0
Constellation Puppis, by Bronger under CC BY-SA 3.0
Zeta Puppis, Second Digitized Sky Survey (DSS2), NASA/ESA under CC BY 4.0
Henry Draper, by W.R. Howell, public domain
Henry Draper's telescope, National Museum of American History, public domain
Orion nebula, by R. Hess www.astrofotografie-hess.at/, free use
Spectrum of Jupiter, NIST, public domain
Jupiter, NASA's Cassini spacecraft, public domain
Harvard College Observatory c.1899, public domain
E.C. Pickering, Library of Congress, public domain
Women computers at the Harvard College Observatory c.1890, public domain
Williamina Fleming, Harvard College Observatory, public domain
Horsehead nebula, by SebusMaximus under CC BY-SA 4.0
Photography of the constellation Puppis, by T. Credner under CC BY-SA 3.0
Annie Jump Cannon, by Smithsonian Institution
Louisa D. Wells, Harvard University Archives
Henrietta S. Leavitt, by M.Harwood, public domain
Edwin Hubble, by NASA/ESA, under CC BY 2.0
Alfred Fowler, by US Library of Congress, public domain
Spectral lines, by Sassospicco/Jhausauer, public domain
Ernest Rutherford, public domain
Zeeman Effect equipment, by N. Bashmakova under CC BY-SA 4.0
Zeeman doublet photograph, Popular Science Monthly, public domain
First Solvay Conference 1911, by Benjamin Couprie, public domain
AIP: American Institute of Physics, Emilio Segrè Visual Archives
CC BY 2.0: creativecommons.org/licenses/by/2.0/deed.en
CC BY 4.0: creativecommons.org/licenses/by/4.0/
CC BY-SA 3.0: creativecommons.org/licenses/by-sa/3.0/deed.en
CC BY-SA 4.0: creativecommons.org/licenses/by-sa/4.0/deed.en
Todos los comentarios (21)
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Even when I can’t follow the maths, I’m entranced by your storytelling. Fantastic telling of the Harvard Computers
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this is the best series of videos on YouTube :) keep up the good work!
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Watching you, I feel like being lost in the pages of a brilliant book. Every video of yours neatly chains with the previous weaving the tale of the great minds that shaped physics the way it is now. Your clear and concise narrative backed up by the mathematical point of view (which I deeply appreciate you showing) make up for a true gem of a channel. As a physics enthusiast (and future student) I find myself pondering over countless questions regarding how everything came to be the way it is. Unfortunately, my school did not focus on the history and motivation behind the physical concepts we learnt, but I stumbled upon your channel at the right time. I vividly remember seeing Planck's constant as a mystery and the hard journey I led myself into while trying to unveil its true nature (this journey also morphed into a school project). I managed understanding and the project turned out great (my high school teacher loved it) but still I felt like this is not everything. Some days passed and I stumbled upon your video about Black Body Radiation and Max Planck's trick of solving the issue and it was love at first sight. Your channel came like a divine hand and since discovering it, many of my questions where answered and I was exposed to so much more quality content you offered. Keep up the brilliant work man! You're the best and I can't wait to see more from you! (and also watch all the other videos from your channel)
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That photograph of a Solvay conference at the end - what an absolute powerhouse of physics talent!
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Really interesting ! I am now waiting on how the next piece of the puzzle was solved by "Sommerfeld".
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Beautiful history and maths. It always amazes me that a mere 120 years ago, arguments erupted over what is commonly taught in grade school now. That the concepts learned eventually set up all the paths for these same grade schoolers to have phenomenal computers in their pockets today.
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Excellent content
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Brilliant. Magnificent job dude!
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End sounds like a teaser for spin :)
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great video, like always
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Truly an excellent series. Here's hoping you keep up the work!
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Bohr's save of re-indexing the series looks like the trick in a clever math video. I can imagine that being old hat to the physicists and mathematicians of his day. :)
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Hmmm this required the Helium in the star to be ionized right? Were there extra lines corresponding to excited but unionized Helium with with 2 electrons? I know that multi-electron atom is a more complicated problem
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I have a test tomorrow but as soon as I saw that you uploaded I came to watch how Bohr saved his model, and I noticed the tradition of not mentioning units in old published papers by the authors still continues :P
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So glad I found this channel and I can’t even remember how. Keep them coming please!
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Please never stop making this videos!!! Fantastic, FANTASTIC videos
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Great storytelling, Dr. Diaz. You framed these concepts in a way that sounds so simple, digestible and intuitive. This channel I just found is a gem.
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This series is awesome, i can see there was a lot of challenges for bohr model but eventually it will lead to the accepted model we have today, we are eventually going to get Schrodinger involved right? Also at 7:12 shouldn't the quantized angular momentum be multiplied by h-bar or am i missing something?
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Great Video, love the way you present the complex data so that the average person can understand and enjoy!!
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11:57: at the age of 45, just heart-breaking, apparently of Pleurisy.
