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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 is the minimum energy released in annihilation of electron positron pair?

Both positron and electron are of equal mass i.e about 9.1*10^-31 kg .

The speed of light is about 3*10^8 m/s, and as per Einstein's theory E=m*c*c .

Total mass = 2*9.1*10^-31 and c*c = (3*10^8)^2 = 9*10^16.

So, energy released = 2*9.1*10^-31*9*10^16 = about 1.637*10^-13 joules, or about 1.02 MeV.

Electron configuration for mercury?

1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f14 5d10 OR [Xe] 6s2 4f14 5d10

Which best describes the relationship between subatomic particles in any neutral atom?

Protons are electrically positive charged, electrons are electrically negative charged, neutrons are electrically neutral. The number of electrons and protons is equal in a neutral atom.

Protons and neutrons are in the atomic nucleus, electrons on electron shells, forming electron clouds.

What does a proton consist of?

A proton consists of two up quarks and one down quark bound together by the strong nuclear force. These quarks are elementary particles that are the building blocks of protons and other hadrons.

How many electrons can be held in the fourth orbital?

The fourth orbital, which is the 4d orbital, can hold up to 10 electrons. This orbital has a higher energy level than the 3d orbital and can accommodate more electrons. Each orbital can hold a maximum of 2 electrons per subshell (s, p, d, f).

The formula of neutron?

The formula for a neutron is n. Neutrons are subatomic particles with no electrical charge and a mass slightly greater than that of a proton. They are found in the nucleus of an atom.

How many 3d electron found in Tin?

In the electron configuration of tin (Sn), the 3d electrons are not present. Tin has a configuration of [Kr] 5s2 4d10 5p2, which means it has 2 electrons in the 5s orbital, 10 electrons in the 4d orbital, and 2 electrons in the 5p orbital.

What is the electron arrangements of potassium?

The electron arrangement of potassium is 2-8-8-1, following the electron configuration of 1s2 2s2 2p6 3s2 3p6 4s1. This means potassium has 19 electrons arranged in four energy levels.

What are quarks name?

The quark model was independently proposed by physicists Murray Gell-Man and George Zweig in 1964. Gell-Mann originally named the quark after the sound made by ducks. For some time, he was undecided on an actual spelling for the term he intended to coin, until he found the word quark in James Joyce's book, Finnegan's Wake

Three quarks for Muster Mark!

Sure he has not got much of a bark

And sure any he has it's all beside the mark.

-James Joyce, Finnegans Wake

Gell-Mann went into further detail regarding the name of the quark in his book The Quark and the Jaguar:

In 1963, when I assigned the name "quark" to the fundamental constituents of the nucleon, I had the sound first, without the spelling, which could have been "kwork". Then, in one of my occasional perusals of Finnegans Wake, by James Joyce, I came across the word "quark" in the phrase "Three quarks for Muster Mark". Since "quark" (meaning, for one thing, the cry of the gull) was clearly intended to rhyme with "Mark", as well as "bark" and other such words, I had to find an excuse to pronounce it as "kwork". But the book represents the dream of a publican named Humphrey Chimpden Earwicker. Words in the text are typically drawn from several sources at once, like the "portmanteau" words in "Through the Looking-Glass". From time to time, phrases occur in the book that are partially determined by calls for drinks at the bar. I argued, therefore, that perhaps one of the multiple sources of the cry "Three quarks for Muster Mark" might be "Three quarts for Mister Mark", in which case the pronunciation "kwork" would not be totally unjustified. In any case, the number three fitted perfectly the way quarks occur in nature.

- From Wikipedia.com

What is the Mass of a single proton or neutron?

Mass of neutron: 1,6749 x 10-27 kg

Mass of neutron: 1,6749 x 10-27 kg

Mass of electron: 0,00091x10-27 kg

What is proton-proton attraction?

Proton-proton attraction refers to the electrostatic force of attraction that exists between two positively charged protons. This force is one of the fundamental forces of nature that holds the nucleus of an atom together. It is responsible for overcoming the repulsive forces that exist between protons due to their like charges.

What is the electron domain geometry of XeF2?

The electron domain geometry of XeF2 is linear. This is because the central atom Xe has two bonded atoms (F) and no lone pairs of electrons, resulting in a linear molecular geometry.

Can neutrons be divided into protons and electrons?

Yes. We can (and do) smash protons. We can slam them into each other or we can slam protons into antiprotons. Big accelerators do this kind of work. The protons will break up, but the things that we get vary as the type of collisions (and the energies) involved in the smashing project. A proton is composed of two up quarks and a down quark, and a neutron is composed of two down quarks and an up quark. The neutron is unstable outside of a nucleus. It has a half-life of a bit under 886 seconds. That's about 14.8 minutes, roughly. When a free neutron decays, it decays into a proton, an electron and an electron antineutrino.

How are the four fundamental forces in physics important in explaining and predicting motion?

The four fundamental forces in physics (gravitational, electromagnetic, strong nuclear, weak nuclear) govern interactions between objects at various scales. These forces determine motion by influencing how objects accelerate, interact, and change positions relative to one another. Understanding how these forces operate is crucial for accurately predicting the behavior of objects in motion and explaining the forces that cause these movements.

What subatomic particles gives an atom its identity?

Protons are the subatomic particles that give an atom its identity. The number of protons in the nucleus determines the element's atomic number, which in turn defines the specific type of atom.

How does the W boson affect beta radiation?

The W boson is the carrier of the weak force (weak interaction), and the weak force is the "boss" of beta decay. The weak interaction mediates the changes that take place in an atomic nucleus just prior to the emission of a beta particle. Let's look at that. In beta decay, one of two things happens. One is that an up quark in a proton becomes a down quark, and the proton becomes a neutron. The weak interaction mediates this, and a W+ boson appears, then becomes a positron and a neutrino. In the other case, a down quark in a neutron becomes an up quark, and the neutron becomes a proton. The weak interaction mediates this, too, and a W- boson appears, and then becomes an electron and an antineutrino. You can use the links below to learn more.

What does it mean when the electrons are excited?

When electrons are excited, they absorb energy and move to higher energy levels. This can happen through various processes like heat, light, or electrical energy. The excited state is temporary, and electrons will eventually return to their original energy levels, releasing the absorbed energy in the form of light or heat.

Which of the four fundamental forces causes friction?

The Electromagnetic force is the only microscopic force causing friction, but the explanation of that force is not simply based on electrostatics or classical electromagnetic theory.

The forces involved with friction are ultimately the forces between atoms at the interface between two materials.

Atoms may attract, repel and become chemically bonded and those processes must be described using quantum theory.

In some cases, atoms or molecules at the interface are charges or have dipoles or other complex charge distributions which interact with other charges or charge distributions through simple laws of electrostatics.

But, neutral atoms interact even when the isolated atoms have no charge and a simple spherical charge distribution. The interaction between neutral atoms and molecules which are far apart (further apart than a few angstroms) are termed "van der Walls forces" and such forces are weakly attractive. When atoms or molecules are closer, then they may develop a chemical bond. If they do not develop a chemical bond that moving even closer results in a rapidly increasing repulsion when the electron clouds of two atoms begin to overlap. This is a result of an increase in the kinetic energy of electrons and also includes some coulomb (electrostatic) effects.

The forces between atoms at close range (the repulsive forces and the van der Waals forces) are not simply electrostatic in origin. The full explanation resides in the quantum mechanical laws governing the electronic structure of the atoms and molecules.

What has 5 electrons in its outer shell?

If you are talking about the valance electrons any elements in group 5 on the periodic table will have 5 valance electrons.

How many core electrons are in Cd?

Cadmium (Cd) has 48 electrons, and its electron configuration is [Kr] 4d10 5s2. This means that the core electrons in cadmium are those in the inner shells, which are the 36 electrons from the noble gas krypton (Kr). Therefore, cadmium has 36 core electrons.

Why is it would be difficult to inject the nucleus of uranium with a proton?

It would be difficult to inject the nucleus of uranium with a proton because the positive charge of the proton would repel the positively charged uranium nucleus, which is also positively charged. This repulsion creates a barrier that needs to be overcome, requiring a high amount of energy for a successful injection.

How do the characteristics of electron microscopes make them useful for studying cells?

Richard tElectron microscope is a very special tool which uses electron beam and invented by knoll and ruska which classified as transmission electron microscope uses 2d electron beam which clearly seen the internal structure of the cell and scanner electron microscope uses 3d electron beam which sweeps over the specimen.So it is very powerful with 5000 magnification of the object than a simple microscope.