How does photoelectric experiment prove the particle aspect of light in opposed to be solely wave-like?
There was a zinc plate that when irradiated with ultraviolet light emitted electrons (charged particles) to a detector which could detect them. It was observed that there was a minimum energy to the light before the photoelectric effect could be observed. It was postulated that photons come in wavepackets. Planck relation gives: $E = h \nu$
Maybe this diagram helps: