Coherent light waves are all in phase. Real images are always inverted. Virtual images are always upright. The particle behavior of light is proven by the photoelectric effect. Large objects have very short wavelengths when moving and thus can not be observed behaving as a wave.
All electromagnetic waves originate from accelerating charged particles.
The lowest energy state of a atom is called the ground state. Increasing light frequency increases the kinetic energy of the emitted photo-electrons. Steam and liquid water molecules at 100 degrees have equal kinetic energies. Temperature measures the average kinetic energy of the molecules. Phase changes are due to potential energy changes.