Lise Meitner's Discover of Nuclear Fission
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- Опубликовано: 29 сен 2024
- David Bisno spoke on October 22, 2023:
Our days should be the best of times. But it is possible that with decisions made in Moscow coupled with our determination to defend democracy, the worst of times could occur. Backed into a corner, there is the possibility that Putin could use nuclear weapons in Ukraine, Latvia, Lithuania and/or Estonia, or recklessly ignite the largest nuclear reactor in Europe. There are reasons why Sweden and Finland raced to join NATO.
What were the origins of this existential horror? Who was responsible? The history and the science which started the atomic age begs for our understanding.
The story, whirling around gender and religion, is one of dishonesty, careless acceptance, and deliberate perpetuation of an untruth. Lise’s extraordinary relationships raise questions of disloyalty and betrayal...or perhaps neither? Fear and self-deception, injustice and distance from the truth are part of the story of the young Viennese woman, Lise Meitner, for whom the study of physics in Berlin was a quest for ultimate truth about our universe...and about ourselves.
Did the lecturer say that accelerators speed up NEUTRONS? LOL Neutrons being neutral cannot be accelerated. He meant to say protons. :-) I would not have expected this mistake even from a historian of physics.
Did the lecturer say that the GREATER the binding energy the MORE mass there is?
Did he say that the sum of the mass of isolated protons and neutrons is LESS than the mass of a bound system with the same number of protons and neutrons?
Did he say that in a hypothetical situation where a 7 oz apple and an 8 oz orange bound together in a bag weigh MORE than 15 oz, for example 20 oz? Is this what he said?
Let us consider a Helium nucleus: two protons and two neutrons bound tightly together. What is the total mass of this Helium nucleus and what is the total mass of two isolated neutrons and two isolated protons? Is the total mass of four isolated nucleons LESS than the mass of the four nucleons bound together in the Helium nucleus? Values of masses can be found in a simple Google search.
What we learn in physics is that the MORE bound a system is the SMALLER is its mass because energy is released in the binding process. Energy is released when an object falls to the earth because the system of earth and object is MORE bound together after the object falls to the earth, therefore the system weighs LESS after the fall.
On the positive side, the speaker really shines and manages to keep the audience interested, the story is great. I love to see more recognition for Lise Meitner.
On the negative side, there are many errors on the description of the physics. I don't expect a historian to know all the nuclear physics behind, but he claims at the beginning that he wants to attempt to explain how nuclear energy is produced so it is impossible not to complain here: the speaker mixes neutron with protons, protons with atomic nuclei, nuclear fission with nuclear fusion, neutrons with uranium nuclei, and he spent almost 10 min explaining the idea of binding energy in a completely messy and somewhat incorrect way.
Despite this, the appreciation and recognition of Lise Meitner's work made watch until the end.
I admire the restrain of the physicist in the audience, he probably had a 'yikes' facial expression several times.
I think there is a problem with the math in the slide that calculates the amu of the helium atom at 1:18:0. The calculated mass is 4.032982 amu while the measured mass is 4.0026404. The measured mass is less than the amu mass, this cannot happen.
I found this Lecture Fascinating & Interesting. I had just very recently found out who Lese Meitner was. I only have a very vague knowledge of Nuclear Physics but I Love the study of the History of Science & Technology.
Lisa Meitner
Mother of carbon-free energy for prosperity.
Lots of issues with this lecture in a technical sense but decent history
May be the worst lecturer. Can’t finish listening …
thanks
Absolutely amazing
Thats a very good lecture 👏
I am glad people are discussing about Lise Meitner,and appreciating her work. I tried to tell people her story,. No body showed any interest. I feel happy now after listening to this very interesting lecture.
Nice
Excellent "History you thought you knew, but didn't." lecture, well done. 👌
I thought this lecture was excellent, but you'd have to be interested in the topic matter and history.
I was interested in how so much energy was released from atoms. That's what brought me to this video, which I watched all the way through and learned a lot
The energy is released from the nuclei of atoms. @@ETAonTheEUC
Such an intelligent speaker but so biased on his political views. Someone should remind him who the "unhinged" leaders are. Not just Putin
❤❤❤❤❤❤❤❤❤
I envy the student of this
dynamic speaker. It’s one
of the best lectures I’ve
heard so far. It reminds me
of a statement attributed
to Einstein: If you under-
stand something, it can be
expressed simply. Bravo!
❤️❤️❤️❤️❤️❤️❤️❤️❤️
Very interesting talk. Thanks. The equation E=mc2 is in the Bible! I once saw a TV show on the equation. The narrator lit a match, demonstrating the small amount of energy from the flame. However, the narrator then pointed out that if all the atoms in the match stick were converted to energy according to Einstein’s equation, it would blow the top off a nearby mountain pictured in the scene. Now read Matthew 17:20. Jesus replies. “Because you have so little faith, Truly I tell you, if you have faith as small as a mustard seed, you can say to the mountain, ‘Move from here to there, and it will move. Nothing will be impossible for you.”
That's a stretch...