Yā n: y initial, un vowel, read it.

Mò: m initial, o vowel, read four tones.

Annihilation, that is, annihilation, refers to a complete process in which material energy is transformed into energy (such as in the form of photons) when matter meets its antimatter, which is also called annihilation, cancellation and cancellation.

After the positron collides with the electron, it annihilates and releases energy in the form of photons. This process still satisfies the law of conservation of charge, because the sum of charges before and after annihilation is still zero.

Extended data

It obeys Einstein's mass-energy relationship E = E's quadratic =mc. Where e is that energy generate by annihilation, m is the total static mass of positive matter and antimatter before annihilation, and c is the eighth pow m/s of the speed of light ≈3x 10.

For example, the energy produced by annihilating half a gram of antimatter is roughly the same as that produced by the Hiroshima atomic bomb explosion (that is, the energy produced by annihilating one gram of antimatter is about 20-30 kilotons of TNT equivalent, or about 20 billion kilocalories).

Electron pair annihilation is the physical basis of positron emission computed tomography (PET) and positron annihilation spectroscopy (PAS). Electron pair annihilation can also be used to measure Fermi surface and energy band structure in metals.