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How does photoelectric experiment prove the particle aspect of light in opposed to be solely wave-like?

quantum steps
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1 Answers1

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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:

https://en.wikipedia.org/wiki/Photoelectric_effect#/media/File:Photoelectric_effect_-_stopping_voltage_diagram_for_zinc_-_English.svg

Maj
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