The discovery of the neutron and its properties was central to the extraordinary developments in atomic physics in the first half of the 20th century. Early in the century, Ernest Rutherford developed a crude model of the atom, based on the gold foil experiment of Hans Geiger and Ernest Marsden. In this model, atoms had their mass and positive electric charge concentrated in a very small nucleus. By 1920 chemical isotopes had been discovered, the atomic masses had been determined to be (approximately) integer multiples of the mass of the hydrogen atom, and the atomic number had been identified as the charge on the nucleus. Throughout the 1920s, the nucleus was viewed as composed of combinations of protons and electrons, the two elementary particles known at the time, but that model presented several experimental and theoretical contradictions. The essential nature of the atomic nucleus was established with the discovery of the neutron by James Chadwick in 1932 and the determination that it was a new elementary particle, distinct from the proton. The uncharged neutron was immediately exploited as a new means to probe nuclear structure, leading to such discoveries as the creation of new radioactive elements by neutron irradiation (1934) and the fission of uranium atoms by neutrons (1938). The discovery of fission led to the creation of both nuclear power and nuclear weapons by the end of World War II. Both the proton and the neutron were presumed to be elementary particles until the 1960s, when they were determined to be composite particles built from quarks. (Wikipedia).
The Atom A1 Rutherford Scattering
The discovery of the nucleus of the atom.
From playlist Physics - The Atom
Physical Science 7.5a - Nuclear Fission - Part 1
The fission of Uranium 235. The discovery of nuclear fission, and a description of what is happening in the nucleus when the atom splits.
From playlist Physical Science - Atoms
Birth & Death of Stars - Part 2/4
Birth & Death of Stars part 2. I gave this lecture at Northwestern University in 2003 for the general public.
From playlist 1 hour Special Talks
Birth & Death of Stars at Northwestern - Part 2/4
I gave this lecture at Northwestern University in 2003 for the general public.
From playlist Astronomy & Astrophysics
Astronomy - Ch. 22: Neutron Star (12 of 17) History of the Discovery of the Neutron Star
Visit http://ilectureonline.com for more math and science lectures! To donate: http://www.ilectureonline.com/donate https://www.patreon.com/user?u=3236071 We will learn about the discovery of the neutron star (pulsar) from being theorized by Baade and Zwicky in 1933 to the merger of 2 ne
From playlist ASTRONOMY 22 NEUTRON STARS & PULSARS
Learn about Nuclear Physics, Nuclear Energy, and the Periodic Table of Elements
The fabled "philosopher's stone" of centuries-old alchemy was always right under our noses—but it wasn't found through chemistry. Nuclear physics shows how one atom can change into another and how some stars are just supersized nuclei. Grab a radiation suit and get ready to go nuclear. Pr
From playlist Science
A quick definition of isotopes. Chem Fairy: Louise McCartney Director: Michael Harrison Written and Produced by Kimberly Hatch Harrison
From playlist Chemistry glossary
**Correction: At 13:57, the proton is converting into a neutron.** Nuclear fusion and fission, gamma rays, neutron scattering & capture, alpha & beta decay, binding energy, and many other topics. My Patreon page: https://www.patreon.com/EugeneK
From playlist Physics
Physical Science 7.4e - A typical radioactive decay
From the Physical Science course by Derek Owens. Eighth grade level. Distance Learning courses are available at http://www.derekowens.com
From playlist Physical Science - Atoms
Top 5 Major Neutron Star Discoveries of 2018
You can buy Universe Sandbox 2 game here: http://amzn.to/2yJqwU6 Hello and welcome to What Da Math! In this video, we will talk about major neutron star and pulsar discoveries of 2018 Support this channel on Patreon to help me make this a full time job: https://www.patreon.com/whatdamath
From playlist Space Engine
LIGO/Virgo Gravitational Wave News (Panel 1)
Original air date: Oct. 16, 2017 at 10 a.m. ET (7 a.m. PT, 1400 UTC). The National Science Foundation brought scientists from the LIGO and Virgo collaborations, as well as representatives for some 70 observatories at the National Press Club in Washington. The gathering began with an overvi
From playlist Astrophysics
We May Have Been Wrong About Major Pulsar Properties
I wrote a foreword for this awesome Sci-Fi book here: https://amzn.to/3aGrg0I Get a Wonderful Person shirt: https://teespring.com/stores/whatdamath Alternatively, PayPal donations can be sent here: http://paypal.me/whatdamath Hello and welcome! My name is Anton and in this video, we will
From playlist Neutron Stars
Incredible Discoveries In the Field of Physics, 3 Hour Video Compilation
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From playlist Long Science Videos
Deep Chatterjee - Machine learning in low-latency electromagnetic counterpart inference
Recorded 29 November 2021. Deep Chatterjee, of the University of Illinois at Urbana-Champaign National Center for Supercomputing Applications, presents "Applications of machine learning in low-latency electromagnetic counterpart inference from gravitational waves" at IPAM's Workshop IV: Bi
From playlist Workshop: Big Data in Multi-Messenger Astrophysics
Kilonova! Gravitational Waves AND Radiation Detected From a Neutron Star Collision
Astronomers have made the groundbreaking detection of two neutron stars colliding in a galaxy 130 million light years away. They detected the gravitational waves AND the blast of radiation released from the collision, observing a kilonova for the first time. Support us at: http://www.patr
From playlist LIGO/Virgo
Pulsar Planets - Recent Updates on These Strange Objects
You can buy Universe Sandbox 2 here: http://amzn.to/2yJqwU6 Or get a shirt: https://teespring.com/stores/whatdamath Hello and welcome! My name is Anton and in this video, we will talk about discoveries of first exoplanets around neutron stars and the recent analysis of whether there are
From playlist Unusual Exoplanets
Strange Magnetar That Seems To Have Solid Surface For Very Weird Reasons
Get a Wonderful Person Tee: https://teespring.com/stores/whatdamath More cool designs are on Amazon: https://amzn.to/3wDGy2i Alternatively, PayPal donations can be sent here: http://paypal.me/whatdamath Hello and welcome! My name is Anton and in this video, we will talk about a magnetar w
From playlist Neutron Stars
What Cosmic Fireworks Unveil About the Universe - Mansi Kasliwal - 2/17/2021
Our dynamic universe is ablaze with cosmic fireworks. Stars explode and send out beacons of light that are a million to a billion times brighter than our sun. Fireworks generated in these explosions are what synthesize most of the elements in our periodic table: while some explosions, call
From playlist Caltech Watson Lecture Series
New Record: 35 Black Hole Collisions But a Few Are Difficult to Explain
Good telescope that I've used to learn the basics: https://amzn.to/35r1jAk Get a Wonderful Person shirt: https://teespring.com/stores/whatdamath Alternatively, PayPal donations can be sent here: http://paypal.me/whatdamath Hello and welcome! My name is Anton and in this video, we will tal
From playlist Blackholes
Physics - Nuclear Physics (1 of 22) Mass of Proton, Neutron, and Electron
Visit http://ilectureonline.com for more math and science lectures! In this video I will show you how to find the mass of proton, neutron, and electron.
From playlist MOST POPULAR VIDEOS