Please specify in a simple way.
Composite particles are any particles which are made up of other particles. Example: protons and neutrons are made up of quarks and gluons.
Thanks , now can you tell me simply what is a quark.. sorry , i am only 13 years old
It may be tough reading for you, but it is a thorough discussion.
You might also try this:
which discusses quarks among other aspects of the "Standard Model" of particle physics.
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