What is annihilation of matter?

Answer 1

Annihilation of matter means that matter and anti-matter disappear into nothing. This conversely means that you get matter and anti-matter from nothing. When electron collide with positron you get two gamma rays. The simple question arise here that when you get nothing from matter and anti-matter, why you get those two gamma rays.

The answer is very simple. When the electron moves, it carries kinetic energy. When the positron moves, it carries kinetic energy. This kinetic energy is released in the form of two gamma rays. One from each particle. Logically one of the two gamma rays has to be anti-gamma ray. The gamma ray and anti-gamma ray should vanish into nothing.

(Now let us see the definition of annihilation given on Google.

I copy paste the same below.

"PHYSICS

the conversion of matter into energy, especially the mutual conversion of a particle and an antiparticle into electromagnetic radiation."

Now take the equation of Einstein. That is E = m c 2.

The speed of the light is very high. But let us take it as low as only one.

Then E = m *1*1.

You take the speed of light as one only. Then only you get one gamma ray from one electron.

That makes mass of one gamma ray or photon equal to the mass of electron or positron. The electron is a particle, whose mass can be measured. The mass of the photon can not be measured. As it is too less. It is supposed to be with out mass.

This is a great googly ball by Google. I am out.

The second question is why do two electrons do not annihilate to form two gamma rays. Why 'especially' particle and anti-particle only?

That is silly explanation by Google.)

The speed of the light is about 300,000,000 meters / second. C square comes to be 90,000,000,000,000,000. That means from one unit of mass you should get 90,000,000,000,000,000 units of energy.

Now you come to the annihilation of proton and anti-proton. You ultimately get electrons, positrons, gamma rays and neutrinos. These electrons and positrons can annihilate into nothing. The gamma rays, which includes anti-gamma rays vanish into nothing. Logically there has to be anti-neutrinos. Both neutrinos and anti-neutrinos vanish into nothing.

Same type of explanation can be given about annihilation of neutron and anti-neutron. They both vanish into nothing.

Answer 2

Annhilation occurs when a particle meets an its antiparticle; its antimatter equivalent. On contact the two will destroy one another and the mass of both particles will turn into energy.