Yes, an accelerating proton (charged particle) also produces an electromagnetic wave. According to classical electromagnetism, any charged particle that undergoes acceleration or deceleration will produce electromagnetic radiation. This phenomenon is described by Maxwell's equations, which are the fundamental equations governing classical electromagnetism.
Maxwell's equations predict that an accelerating charged particle, whether it is an electron or a proton, will generate electromagnetic waves. When the charged particle accelerates, its electric field and magnetic field change, creating oscillating disturbances in the electromagnetic field. These disturbances propagate away from the charged particle as electromagnetic waves, carrying energy and momentum.
It's important to note that the properties of the electromagnetic waves produced by accelerating charged particles depend on various factors, including the acceleration magnitude, the nature of the particle, and the motion's characteristics. For example, the frequency and intensity of the radiation emitted by an accelerating charged particle can vary based on its acceleration profile.
In summary, both electrons and protons, as charged particles, can produce electromagnetic waves when accelerated, in accordance with Maxwell's equations and the principles of classical electromagnetism.