system
Given the following post, respond as if you're commenting on Reddit:
human
What type of radiation is produced by the annihilation of interacting matter and antimatter particles?

It is said that when an particle of matter and antimatter interact they annihilate releasing all of their energy. 

What is the frequency of the radiation energy that results? What determines this?
gpt
Typically high energy photons aka gamma rays. If the collision is relatively low-energy then they photons will have the same energy as the mass of the particles, so for electron-positron collisions that's 511 keV or about 10^20 Hz.