Photoelectric Effect
The Photoelectric Effect
The photoelectric effect is the phenomenon where electrons are emitted from a metal surface when light shines on it. This effect helped confirm that light has particle-like properties called photons.
How it Works
- Light (photons) hits the metal surface.
- If the photon's energy is high enough, it ejects an electron.
- This only happens if the frequency of light is above a certain threshold.
Einstein's Photoelectric Equation:
K.E. = h·f − φ
Where:
K.E. = kinetic energy of the ejected electron
h = Planck's constant
f = frequency of the light
φ = work function of the metal (minimum energy needed)