Photoelectric Effect
What is Photoelectric Effect?
The photoelectric effect is the emission of electrons from a material surface when it is illuminated by light of sufficient frequency (above the threshold frequency), demonstrated by Heinrich Hertz and explained by Albert Einstein in 1905 using the concept of photons. The kinetic energy of the emitted electrons depends only on the frequency of the incident light, not its intensity, proving the quantized (particle-like) nature of light. Einstein's explanation of the photoelectric effect earned him the Nobel Prize in Physics in 1921 and was foundational to quantum mechanics.
Key Facts
Frequently Asked Questions
The photoelectric effect is the emission of electrons from a material surface when it is illuminated by light of sufficient frequency (above the threshold frequency), demonstrated by Heinrich Hertz and explained by Albert Einstein in 1905 using the concept of photons. The kinetic energy of the emitted electrons depends only on the frequency of the incident light, not its intensity, proving the quantized (particle-like) nature of light. Einstein's explanation of the photoelectric effect earned him the Nobel Prize in Physics in 1921 and was foundational to quantum mechanics.