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Are the rest mass of the positron and the electron exactly equal?
Wiki User
∙ 11y ago
Yes; they simply have opposite charges.
Wiki User
∙ 11y ago
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What is the mass of an electron approximately equal to?
1/1836 the mass of a proton
What is the ratio of a proton to the mass of a neutron?
The mass of a proton and neutron are pretty close. So the ratio will be roughly 1 to 1 (or 1:1). The neutron is heavier and if memory serves it is exactly the mass of an electron heavier than a proton. Note it takes around 1820 electron to equal the mass of one proton.
Why doesn't the electron contribute to the mass?
They do, it's just such a small contribution that in practice it's usually negligible. It takes about 1800 electrons to equal the mass of one proton.
How does the mass of the nucleus compared to mass of an electron?
The mass of a nucleus varies according to the atomic number (ie according to what element it is). For hydrogen , the simplest nucleus, the combined mass of the one proton and the one neutron would be equal in mass to 3672 electrons.
What is the definition of annihilation in physics?
the conversion of matter into energy, especially the mutual conversion of a particle and an antiparticle into electromagnetic radiation.Above is the definition, that is given for annihilation, on Google.The positron and electron annihilate into two gamma rays.As per the equation of Einstein, you have E = m * C square.Now that the mass of electron and positron is same. So you put the mass of both into the formula.You get 2 E = 2 m * C square.You divide this equation by 2.You get, E = m * C square.That means from one positron, you get one gamma ray.That means from one electron, you get one gamma ray.That means from one gamma ray, you get one electron.That means from 2 gamma rays, you get 2 electrons.( Just multiply the equation by 2.)(Here C is the speed of light. It is very high figure. The square of the speed of light is too high a figure.it's about 300,000,000 m/s. The square of 300,000,000 comes to be 90,000,000,000,000,000.)The electron is supposed to be the smallest mass in the atom. The photon emitted is supposed to be the smallest unit of energy. So if you multiply the one electron by the figure 90,000,000,000,000,00, you get minimum 90,000,000,000,000,000 photons emitted. From the positron also you should get the same amount of energy got released. Gamma ray is high frequency photon emitted. Only two gamma rays are emitted. "Two gamma rays are produced out of the mass of two electrons (or positrons) into energy" is the most not so wise statement I have ever encountered.So the mass to energy ratio just does not match.So either the equation of the Einstein is wrong, or the definition of the annihilation is wrong.Here the definition of annihilation is wrong.The fact is that mass get destructed into nothing in case of annihilation. The gamma rays come from the kinetic energy of the electron and positron. Mathematically one of the two gamma rays is anti-gamma ray and other is gamma ray.It comes that mass of the electron is plus m. The mass of the positron is minus m.The plus m + minus m = 0.So from zero, you get positron and electron.So from zero you get matter and anti-matter.Hence proved.
Is The Mass Of An Electron Is Equal To The Mass Of A Neutrons?
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.
Why isn't electron and positron mass equal?
Their masses are equal. It's their charges that are opposite.
How is a positron different from an electron?
A positron is an electron's antiparticle. It has the same mass as an electron, but an opposite electrical charge.
The rest mass energy of an electron positron pair is?
Twice the mass of the electron, since the positron has the same mass of the electron. Or the equivalent, in energy units.An electron has a mass or energy of 511 keV.
Is a proton the opposite of a electron?
No. The opposite of an electron is an antielectron or positron, which has exactly the same mass but opposite charge. A proton has opposite charge from that of an electron, but it is about 1836 times more massive.
What particles has the same mass as an electron but a positive charge and is sometimes emitted from the nucleus during radioactive decay?
Protons are rarely emitted, but a decay mode called positron decay is very common. The positron is the antiparticle of the electron and is exactly the same mass as the electron. It has charge +e.
What is the mass number of a positron?
The mass of a positron is approximately 9.1093826(16) × 10−31 kg. The positron and the electron are anti-particles of each other, and you can find out more about the positron at the Wikipedia article on that subject. A link to their post can be found below. There is also a link to a related question on the nature of the positron. That's down there, too.
Do positrons are similar to electrons?
It's all quite simple. The electron is a subatomic particle carrying a negative electric charge. It has no known components or substructure, and therefore is believed to be an elementary particle.[2] An electron has a mass that is approximately 1/1836 that of the proton. The positron or antielectron is the antiparticle or the antimatter counterpart of the electron. The positron has an electric charge of +1e, a spin of 1⁄2, and the same mass as an electron.
What is a particle with a positive chatge?
A beta particle is an electron, and electrons are negative. You're probably thinking of a positron, which has the same mass as an electron but the opposite charge.
What would happen if a positron met an electron?
When a positron meets an electron, they annihilate or destroy each other.This phenomena is known as annihilation of matter. During this process two photons of gamma rays are produced that travel in opposite directions.Actually the mass of electron and positron has been converted into energy (gamma rays).
Why you need 1.022 Mev in pair?
Pair production can only occur if the energy of the photon is bigger than the rest mass (E0 = m0*c^2) of electron and positron, because this is the energy needed to create these particle (conservation of energy). Excess energy will be kinetic energy of the electron and positron. Rest mass of electron and positron is 0.511 MeV each, so 1.022 MeV in total.
What decay decreases atomic mass by 1?
Beta with a decay of a positron (as opposed to the more common electron).
