What are antiparticles and what do they do?

[parshyaa]

What are antiparticles and what do they do?
How do we know that they do exist?
Could you explain these in layman's term,because I don't know much about quantum mechanics.

 

[Nugatory]

We know that antiparticles exist because we routinely observe them in particle accelerators , cosmic ray interactions, and nuclear decays.

If you want to know what they are and what they do... start with a google search. We can help you with specific questions about the parts you're not understanding, but we can't do your studying for you.

This thread is closed; you can start new threads as necessary with more specific questions.

 

[fresh_42]

This is exactly made to provide such answers:
https://en.wikipedia.org/wiki/Antiparticle
1.

In particle physics, every type of particle has an associated antiparticle with the same mass but with opposite physical charges (such as electric charge).

2.

Because charge is conserved, it is not possible to create an antiparticle without either destroying another particle of the same charge (as is for instance the case when antiparticles are produced naturally via beta decay or the collision of cosmic rays with Earth's atmosphere), or by the simultaneous creation of both a particle and its antiparticle, which can occur in particle accelerators such as the Large Hadron Collider at CERN.

It is not prefect and the wording might be a bit sloppy, but it is a good source to get the basics which you asked for. And of course we know they exist, because we've measured them by their properties.