0
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 are electrons that are located at a given distance from an atom's nucleus in a region called?
valence electrons
What happens when photons collide?
when two photons collide:-
1.a new photon gets formed
2.its direction will be different from that of the two photons.
3.the energy of the photon will remain the same
How many neutrons have an atom with a mass number of 20 and 11 neutrons?
How many neutrons would it have if it had 11 neutrons? 11.
What is the smallest subatomic particles?
Of the three basic particles that atoms are made of, the electron is the smallest.
Why do antimatter and matter react when they touch what's the chemistry of it?
Matter-Antimatter reactions are not chemical reactions. They are very complex sub-atomic reactions, and the nature of the annihilation depends on the matter and anti-matter in the reaction.
One of the simplest matter-antimatter annihilations is between an electron and a positron (an anti-electron). The electron has a negative charge and the positron has a positivecharge. When they come in to contact (under the right conditions) they must annihilate, since one cancels out the other.
However matter cannot simply dissappear, so it must be converted to energy via E = mc^2 where E is the energy released, m is the combined mass of the electron and positron, and c is the speed of light.
In the case of the electron-positron annihilation this results in two gamma rays of a certain energy.
As the size and complexity of the matter-antimatter reactions increases so does the complexity of the reactions.
If a hydrogen has 2 neutrons is it an isotope?
The number of neutrons in hydrogen depends on the isotope. Protium,deuteriumand tritium have 0, 1 and 2 neutrons respectively.
How many quarks are in molybdenum?
The count of quarks in an atom of molybdenum would depend on the nuclide's mass number (A), or in other words, on which isotope. 3 * A = (quark count) since both neutrons and protons have 3 quarks each. The lowest we know about (Mo-83) would have 249 quarks, the highest (Mo-115) would have 345. Molybdenum-98 is the commonest isotope with (3 * 98) quarks.
Is the mass of a proton half the mass of a electron?
No. The mass of a neutron is far, far, far greater than the mass of an electron. In fact, the mass of a neutron is approximately about 1840 times greater than the mass of an electron.
The particle that has exactly the same mass as an electron is its antiparticle, the positron.
What particle defines an element?
The number of protons in an atom's nucleus determines the identity of element. The number of protons equals the atomic number.
What can nuclear particles do to the atmosphere?
It poisons the air with nuclear dust that can lead up to 2 to 2000 Roetgens. Theese when inhaled cause cancer and if it is highly radiocative, It can kill a man in seconds.
What subatomic particle derives its name from the Greek word for a type of semiprecious stone?
Electrons is the subatomic particle that derived its name from the Greek word for a type of semiprecious stone.
How are the atomic mass unit change of an electron expressed in scientific notation?
The mass of electron is 5,485 799 090 70(16)×10−4 amu.
What is a transmission electron microscope image formed by?
electrons passing through ultra thin samples of cells or tissues
How can the subatomic particles be distinguished?
They have different masses, electrical charge, dimensions, life time, spin etc.
Why do you only sketch the valence electrons in the electron dot diagram?
valence electrons are the parts of an element that will attach to another element, but only if they reach a certain point. nothing else is a factor. the only other thing added is polarization, which affects how the shape of an atom will come out
The calculated mass of the nucleus is always greater than the experimentally determined mass.This difference is variously called as mass defect,mass deficit or mass decrement.The reason for mass defect is that,this deficit mass has been transformed into the nuclear binding energy by Einstein equation E=mc2.
An alpha particle is composed of which subatomic particles?
A Helium Nucleus so 2 protons and 2 neutrons
Quarks are contained within the neutrons & protons and there are many types
How many protons and neutrons are in the nucleus americum oxide?
There are 214 protons and neutrons in the molecule.
Which is the smallest of the basic forms of subatomic particles?
Quark is the smallest particle ever discovered.
Why must a positively charged body have a deficiency of protons?
It doesn't. A positively charged body is deficient in electrons. In an uncharged object there are equal numbers of positively charged protons and negatively charged electrons. Removing electrons will leave more protons than electrons, so the object will be positively charged. Such an object is said to have a deficiency or electrons rather than a surplus of electrons because it is generally easier to remove electrons than it is to add protons. Electrons occupy the outer shells of an atom and have a much lower mass than protons. The protons, by contrast, are bound together in the dense nucleus.
Which is the smallest item to be in existence?
Quarks are the smallest things in existence. A quark is an elementary particle.
What is Quark Express 8 used for?
Quark is a page layout system for publishing including desktop publishing. 8 is how many prior versions there have been. As you can see, Quark Express has been around for a long time.
