Einstein and the Photoelectric Effect

In 1905, they faced a mystery. Light hits metal, electrons fly free.

Classical physics made a prediction. Brighter light means more collision. But something weird

was going down. Their equations couldn't stick around. What if light's not just a

wave? What if particles behave like tiny packets full of punch?

Einstein had a quantum hunch. Frequency's the secret key. Unlocking this mystery.

Here's the twist that blew their minds. Brightness doesn't change the kinds

of energy those electrons gain. Only frequency breaks the chain. Crank the brightness,

more escape. But their speed stays the same shape. Red light weak