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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.
