Is it oscillating charges/accelerating charges that produce electromagnetic radiation?

That's one method. Electron or nuclear transitions, radioactive decay and matter/antimatter annihilation are others. Anything involving the electromagnetic interaction could do it.

Can a neutron emit electromagnetic radiation or is that only oscillating electron and proton?

3 hours ago, Achilles said:

Can a neutron emit electromagnetic radiation or is that only oscillating electron and proton?

Yes, All particles, electrons, protons and Neutrons emit EMR. All have spin, and magnetic moments aligned with that spin. All particles are made up of quarks. The Neutron has 2 Down [1/3 negative charge]  and 1 Up quark [2/3 positive charge]... Doing the maths,             

    -1/3 + -1/3 + 2/3 = 0 [hence overall neutral. ]

Proton: 2 Up quarks plus 1 Down quark....2/3 + 2/3 + -1/3 = 1 [positive overall charge]

[A long time ago I read a very reputable book [although much was beyond me] called the "Quark and the Jaguar"by Murray Gell-Mann.         

 

CORRECTION: Where I said "All particles are made up of quarks." is wrong. Electrons are actually fundamental.

Edited August 25, 20187 yr by beecee