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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

How many protons added to the nuclei of oxygen atoms so it will glow red?

An oxygen atom can only have 8 protons. If you were to add any it would no longer be oxygen. But if you were to add 2 protons to it, it would become the element neon. When neon becomes ionized it glows a an orangy-red.

How do pions decay into muons?

Negatively charged pions decay into muons and muon anti-neutrinos via the weak nuclear interaction. The probability of such a decay occurring is approximately 99.98%. Muons can also decay into electrons and electron anti-neutrinos, but the probability of such a thing occurring is only about 0.012% Positively charged mouns decay into anti-muons and muon neutrinos instead. Neutral pions decay into either two photons or a photon and one electron and one positron.

One decay of a negatively charged pion produces one muon and one muon anti-neutrino.

Is an atom that has six electrons stable?

No, an atom with six electrons will try to react with another atom to gain two more electrons. Actually the fewer electrons the atom needs the more reactive it will be unless it has exactly eight valence electrons in its outer shell like a noble gas(He, Ne, Ar, etc.) Hope this helps!

The subatomic particle that J J Thomson discovered has an?

He discovered the electron which has a negative charge of 1.602 x 10-19 coulombs and a mass of 9.1 x 10-31 kg.

Do gamma rays have negative charge?

No, gamma rays are electromagnetic radiation which has no charge.

How do you accelerate electrons?

A good way to accelerate electrons is with voltage. The higher the voltage, the more acceleration. Vacuum tubes do this. Like the cathode ray tube (or picture tube) in a conventional television. Electrons stream from the electron guns at the back of the tube to the phosphor coating on the inside of the face of the glass in front. The intervening space is highly evacuated. Electrons scatter terribly when striking anything, even gas atoms in air. We can really accelerate the electrons when we hit them with good ol' high voltage. In an x-ray generating tube the effects are even more dramatic. Amazing what a few extra tens of thousands of volts will do to speed the little guys up across the evacuated space between the elements of the x-ray tube. Oh, but there's a problem. Once speeded up like that, the electrons will eventually slow down by scattering. And when the highly accelerated electrons in the x-ray tube strike the metal target plate, they generate (surprise!) x-rays. And x-rays aren't to be fooled around with. They are penetrating ionizing radiation. There are linear and circular particle accelerators that can ramp up the speed of these little guys much more than can be accomplished in a vacuum tube, but it's hazardous work. More energetic x-rays can be generated by blasting a target in an accelerator with high speed electrons, and shielding in the target buildings of these facilities is yards thick. As an aside, particle accelerators are usually used to speed up protons, antiprotons and heavy ions and slam them around. Particle physics requires more work in those areas. Electron scattering is understood a little better than other aspects of nuclear physics, so there are limits on the amount of research using accelerators to speed up electrons. Think about it this way. An electron is to a proton something like a table tennis ball is to a bowling ball. Which one do you want to slam into stuff to see what happens, hmm?

What does mean by 6 space-time dimension?

Our universe is comprised of 10 dimenions- 9 spatial dimensions plus one of time. The three we experience are defined as length, width, and depth. The remaining six are tiny- approximately 10^(-35) meters across. With a size such as that it is impossible to detect, and therefore we only experience those three. It is assumed that those dimensions curled up shortly after the big bang- some physicists argue that it happened when gravity split off of the Unified Force, approximately 10^(-41) seconds after the big bang (literally an instant after). Mathematics conclude that there are 9 spatial dimensions because of how weak gravity is in comparison to the other forces.

This is all explained by String Theory, which I highly recommend you look into if you want a more complete answer.

How many neutrons are in Cu-63?

Number of neutrons = Mass number - Atomic number = 63 - 29 = 34 neutrons

Thin wires have a what resistance to electron flow than do thicker wires?

Thin wires have a greater resistance rhan thick wires. Imagine a straw. The thinner the straw. the less liquid can get through. Wires work the same way.

Does the volume of matter come from protons or electrons?

The number of electron orbitals is where the volume of matter comes from. The more electrons and orbitals, the more volume.

The mass comes from the protons and neutrons.

Do Solar Cells run out of electrons?

It won't run off. The Photo Voltaic create electron motion and the energy is tapped from the electron motion. The electron itself is not consume as energy but is the media energy would store. Picture hydropower, water evaporate to cloud and fall on high ground and the motion of water stream was tapped out to hydropower. Water is not depleted in the process because it is the kinetic and potential energy that water gain from sun in process of evaporation that is use.

What is the subatomic particle known as the maon and who predicted its existence. I'm absolutely sure that it is maon.?

Perhaps you meant the meson. Mesons are composed of two quarks, a quark and its antiquark. I'm not sure who predicted them but I believe the pi-meson was the first discovered. Then suddenly many more were discovered that were not predicted and they didn't know what to do until the current Standard Model was developed.

What is the range of neutrons in a tungsten atom?

The most common isotope is 110 and the average for the neutrons are 109.84

How many electrons in Bohr?

Bohr theory was introduced using hydrogen atom, it's not applicable to each and every atom, even for the other isotopes of hydrogen.

How many neutrons does lanthanum have?

82 in the stable isotope 139 La which makes up over 99% of naturally occuring lanthanum. It has 81 in the stable isotope 137La which makes up <1% of naturally occuring Lanthanum.

If 2 protons are removed from an oxygen nucleus?

You will have an unstable carbon atom. The result will be carbon

There are four electrons in every electron shell?

No, on the most inner shell, only 2 electrons can be held, but then on every other shell it is usally 8