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Particle Physics

Relatively recent experimental results have confirmed what philosophers throughout history had theorized all along; that all matter is made up of elementary particles. Those curious about this cutting-edge field of physics known as particle physics should post their questions here, including those about fundamental particles, fundamental forces, Grand Unified Theories, and the extraordinary devices that have been or need to be engineered to research them.

3,842 Questions

What model is a 1906 manufactured 38 caliber considered to be Is it a model 1906 or a model 94?

The model 1906 was only made as a .22 caliber. It is also a slide (pump) action while the model 94 is a lever action. A model 94 made from 1894 to 1929 should be marked "Model 1894". If a model 94 is a .38 caliber it should also be marked "38-55 WCF".

What are the main drugs used as proton pump inhibitors?

There are five drugs in this class: esomeprazole (Nexium), lansoprazole (Prevacid), omeprazole (Prilosec), pantoprazole (Protonix), and rabeprazole (Aciphex).

How is quark produced?

Current scientific theory places the production (creation) of naturally occurring quarks prior to the end of the inflationary period; later during the "hadron epoch" after the Big Bang when the universe had cooled sufficiently, the familiar baryons, composed of quarks, could form - such as neutrons and protons - and were able to coalesce from the quark-gluon plasma.

In the laboratory setting it is possible to create quarks in high energy collisions; the energy of the collision needs to be adequate to produce them - i.e., it would have to be at least equal to their mass-energy as described by the matter-energy equivalence equation (E=mc^2). The greater the mass, the more energy is required. Because it's not completely predictable, the production of a quark is somewhat random, other particles may be produced in any given collision, and it is more of a statistical phenomenon than a deterministic method.

Why are neutrons fired at the uranium nuclei?

Under bombardment with thermal neutrons a nuclear fission is produced with the isotopes 235U and 233U; a formidable energy is released after fission.

Which element has negative charged proton?

All protons have a positive charge. The antimatter equivelant to the proton, the antiproton, has a negative charge. Every element of matter (hydrogen, helium, etc.) has an equivalent antimatter element (antihydrogen, antihelium, etc.) and just as every element of matter has a proton in its the nucleus (which, again, is positively charged), every corresponding anti-element has an anti-proton in its nucleus (which is negatively charged).

There are also theoretical "hybrid" elements (called exotic elements of atoms) consisting of both matter an antimatter components, such as a proton and antiproton orbitting each other (this is called Protonium).

What does the M in M-theory stand for?

It is generally agreed that the M stands for "membrane" though the words magic, matrix, mother, and some others, have been suggested. The scientist who named this theory actually didn't say what the "M" stands for.

Why are electrons called electrons?

Because the name used to be "Corpuscles" as when J.J. Thompson called it using his cathode ray tube experiment, but the name was later renamed to electron. "elec" I think has something to do with negative charge and "tron" is the regular ending of a name of a particle in an atom.

What are leptons and quarks?

Hadrons, examples of which are protons and neutrons, are made up of different combinations of the six "flavors" of quarks, which are up, down, strange, charm, top and bottom. Each quark has a different mass and either has a charge of +2/3 or -1/3. All quarks have a 1/2 spin.

Leptons are categorized into six sections: electrons, muons, taus, tau neutrinos, electron neutrinos, and muon neutrinos. All of the leptons have a 1/2 spin, with the neutrinos having a charge of 0 and the other three having a charge of -1.

Basically, as the Standard Theory states, that all matter is made up of combinations of quarks and leptons with the various types of force particles.

Who invented the Boson particles?

The "Higgs" of Higgs boson is well known to refer to Peter Higgs, the British researcher who in 1964 laid much of the conceptual groundwork for the presence of the elusive particle.

What is largely unknown, at least to non-specialists, is that the term "boson" owes its name to the pioneering work of the late Indian physicist, Satyendra Nath Bose.

In 1924, he sent a paper to Albert Einstein describing a statistical model that eventually led to the discovery of what became known as the Bose-Einstein condensate phenomenon.

The paper laid the basis for describing the two fundamental classes of sub-atomic particles -- bosons, named after Bose, and fermions, after the Italian physicist Enrico Fermi.

What is the differences between a w boson and a virtual photon?

W-bosons are charged and the photons are uncharged, W-bosons have a non zero rest mass and photons hsve zero rest mass. Also the W-boson is the "exchange particle" in interactions involving the weak nuclear force, but photons are the exchange particle of the electromagentic force.

How in the world did physicists discover something as small as neutrino?

It started with water. When scientists were trying to unlock some of water's secrets, ultraviolet light detectors found sources of UV light emitted from very pure water. Further studies found that neutrinos were zipping through the pure water and were emitting UV light as a result of its reaction with water.

Basically, it was accidental, as most discoveries these days are.

What is the number of subatomic particles for copper?

Copper has 29 electrons and protons; the number of neutrons is specific for each isotope.

Number of neutrons in a copper isotope = Mass number - 29

What is bombardment?

It is where a military force bombs a place with artillery and other weapons.

What is the electron pair geometry for O3?

the electron pair geometry would be trigonal planar because there is a lone pair on the oxygen atom. The molecular pair geometry would be bent

Is the current in intrinsic semiconductos du to fre electrons or valence electrons and what is the diff between them?

Well intrinsic semiconductor is semiconductor crystal with no impurities in it. In intrinsic semiconductor the electrons in valence band(valence electrons) gain energy(due to thermal enegry) and break free into conduction band(means it become free electrons). As this electron breaks free, a vacancy is created in place of it. It is called as a hole. This hole has a positive charge. So current in semiconductor is due to flow of this free electrons and holes. But this current is very small in magnitude. The difference between free electrons and valenece electrons is that valence electrons are often bonded to other atoms in crystal. But free electrons can freely move throughout the crystal.

What is the electron configuration for a element that's not chemically reactive?

The rule is that all of the orbitals (respectively - all of shells and blocks) of the element must be filled with their maximum number of electrons.Such phenomenon is observed in the noble gases (group VIII A) - their last blocks - s and p are filled with the total number of 8 electron (2 for s and 6 for p).

For instance - The Argon (Ar) has 18 electrons and its configuration is:

1s22s22p63s23p6

How is neutron degenerate matter created?

Neutron stars are created when a massive star runs out of hydrogen to burn and become a supergiant. The supergiant will then explode and only leaves a core and a nebula. The dense core will then become a neutron star or a black hole.

Why does the electron cloud have a very small mass?

The electron cloud has such a small mass because that's where all the electrons are! Electrons are fundamental particles having a mass of only 9.109 X 10-31 kg. To put that into perspective, a proton has a mass of over 1,800 times that of the electron.

What is the proton neutron electron does bromine have?

  • The atomic number of Bromine is 35. That means the number of protons for the Bromine atom is 35 protons.
  • The number of electrons in the Bromine atom is also 35.
  • Bromine has two stable isotopes, 79Br (50.69%) and 81Br (49.31%). At least 23 radioisotopes are known. Accordingly, the number of neutrons for these two stable isotopes is respectively 44 and 46 neutrons.
  • The isotopes of bromine range from 67Br to 98Br. That means the number of neutrons in a Bromine atom ranges from 32 to 63 neutrons.
  • Refer to link below for more information.

Why strange and charm quarks named so?

The quarks are all named the way they are as some physicist thought it was cute. No reason.

What is leptons?

LEPTONS are basically family of fundamental subatomic particles consisting of electron, muon, tauon(tau) particles with their corresponding neutrinos They have spin 1/2. They do not strongly interact.

What is a solar neutrinos?

Solar neutrinos are electron neutrinos that are in the sun. The sun is what produces nuclear fusion.