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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 particles or structure would not contain any quarks?

Any particle that is not a hadron does not contain quarks. Fundamental bosons and leptons are the only category of particles that do not contain quarks.

Which subatomic particle can also be called a nucleon?

A nucleon s a particle that makes up the nucleus of an atom. Protons and neutrons are both nucleons.

Explanation of fast neutron and slow neutron in nuclear reaction?

Free neutrons are said to have a speed or a temperature. Both ideas mean pretty much the same thing, which is that they have an amount of energy associated with them. It is specifically measured most commonly, perhaps, in electron volts (eV), or as Million electron volts (MeV). Unfortunately, what is meant by fast or slow depends on the application, and perhaps the author or speaker.

Free neutrons come from different sources and have different speeds when they are produced. As they fly about, they hit the nuclei of atoms, and may bounce, imparting some part of their energy to the atoms if they do. As time passes, they lose energy in this manner getting slower and slower. Please note, however, that not much time usually passes, because the half life of a neutron is a bit less than fifteen minutes.

There are other things that neutrons can do besides bounce. They can cause decay of a radioactive atom, they can cause fission of a fissionable atom, and they can be absorbed. There is a likelihood of any of these events happening by the collision of a neutron with an atom, and the likelihood depends on several things. Of great importance is the isotope of the atom; different isotopes have different cross sections, the cross section being a measurement of how likely it is for the neutron to interact with the atom. Also very important is the temperature of the atom, and the speed of the neutron.

The cross section of the atom will be greater or less depending on the speed of the neutron and the temperature of the atom, but not in a way that is easily predictable. A faster neutron might not cause fission as easily as a slower one in a given situation. The data on the nuclear cross sections of atoms by isotope, temperature, and neutron speed, were largely obtained empirically.

How many electrons are in a selenium-76 atom?

This is a chemical element. You can find the how many electron in a single atom by using a periodic table.

What is advanced dbms?

Simply stated, that is an acronym for an advanced 'Database Management System', which is a software package that would facilitate the development of various applicable databases.

See the related link listed below for more information:

What connect quarks?

A Gluon - the force-carrying particle of the strong nuclear force.

Describe how valence electrons in a metal move?

The characteristic that allows some metals to be better conductors of electricity is that they have 'free electrons'. Free Electrons simply means that there is a weaker bond between the electrons on the outer valence shell to the nucleus of the atom, than other atoms. This weak bond allows electrons in metals to become more easily excited (when mechanical means of generation occurs), where the electrons are able to transfer from one atom to another.

I imagine this is what the question is asking. Basically, electricity is inherent in the material. Metals have weak bonds in their outer valence electron shell.

A: In metals, the atoms move freely, allowing heat to travel faster. :)

Who introduced string theory?

Gabriel Vinetciano found an equation explaining the strong nuclear force.He found an equation and published his papers.This led to the foundation of the string theory as these equations were an answer to the string theory

Why do ants move faster than elephants and why is it that the smaller a creature the quicker it moves and talks and the faster time moves for them and is time experienced relative an objects size?

the reason that ants move faster then elephants is because there is less friction between their feel and the ground meaning that they can move them faster and with less difficulty. this is also because they are lighter in weight!

How do scientists know that the quark is the smallest unit of matter?

In the Standard Model, the quarks are not the smallest unit of matter. The leptons are, specifically the electron neutrino, Ve, with a mass of less than 2.2 eV.

What are 4 methods of electron emission?

1- Secondary Emission

2- Thermionic Emission

3- Field Emission

4- Photo-Electric Emission

Badbanky

What type of penetrating power does beta particles have?

Beta particles have a very low penetrating power; an aluminium foil of 3-4 mm is a sufficient shielding.