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What is the opposite of a photon?
The opposite of a photon is an antiphoton.
What is an anti-photon and do they even exist?
Quantum field theory requires for consistency reasons that every charged particle has its antiparticle. If the particle is uncharged then quantum field theory does not put any other impulsion and so we do not need antiparticles for photons. The reason behind it is that they are not charged. But you can still consider the same operation of keeping mass and spin and exchanging charges and since the photon remains unaffected by this, you can decide to identify it with an antiphoton. So it depends on you whether or not you want to consider photons to have antiphotons or not. Answered by Tanishq Choudhary
What type of particle would not be deflected by a magnetic field?
A neutron, an antineutron, a neutrino, an antineutrino, and a photon would not be deflected by a magnetic field, as they all have no net electric charge. I do not find a reference to an antiphoton, but it makes sense that, if it existed, it would also not be affected by a magnetic field.
What subatomic particles in an atom has no charge?
There are many subatomic particles with no electric charge. An atom is comprised of three main subatomic particles. They are the proton, neutron, and the electron. While the proton carries a positive charge and the electron carries a negative charge, the neutron carries zero electrical charge, and is described as being electrically neutral, hence the term "neutron." There are also other subatomic particles that are electrically neutral. The most obvious would be the antineutron, which is simply the antimatter version of the neutron. But since both of these particles are electrically neutral, they can survive in matter or anitmatter and even transverse both without anihilating. And then there are some particles you may not have heard of. They are the byproducts of fusion and fission reactions, as well as of emissions from radioactive decay in unstable atoms. These particles are known as neutrinos, and there are three types: electron neutrinos, muon neutrinos and tau neutrinos. Each type of neutrino is also matched by its antimatter counterpart, and are consequently known as antineutrinos. And still there are more particles that are electrically neutral. To reiterate, a particle that is also its own antiparticle will always be electrically neutral. More examples include the photon, gluon, and Z-boson, as well as their antimatter twins, the antiphoton, antigluon, and anti-Z-boson.
