When was the photon first identified as the particle of light?
Quick Answer
In 1905, Albert Einstein’s explanation of the photoelectric effect treated light as quantized packets, later called photons. The term photon came into common use later.
The Full Story
Albert Einstein’s 1905 explanation of the photoelectric effect was the key step in identifying light as coming in discrete packets of energy. Although the word photon was not yet standard, the idea that electromagnetic radiation is quantized was revolutionary. The modern photon concept was developed over the following decades through quantum theory. This work helped establish the quantum nature of the electromagnetic force.
Key Facts
YouTube Angle
Suggested video title for this topic:
"Light is not just a wave—its particle nature changed physics forever in 1905."
Was this answer helpful?
Tap a reaction — it helps us pick what to cover next.