Photon
What is Photon?
A photon is a quantum of electromagnetic radiation — the fundamental particle of light and all electromagnetic waves. Photons are massless, travel at the speed of light (3×10⁸ m/s), and carry energy E = hν, where h is Planck's constant and ν is the frequency. The photoelectric effect, explained by Einstein in 1905, demonstrated the particle nature of light and established the photon concept.
Key Facts
Frequently Asked Questions
A photon is a quantum of electromagnetic radiation — the fundamental particle of light and all electromagnetic waves. Photons are massless, travel at the speed of light (3×10⁸ m/s), and carry energy E = hν, where h is Planck's constant and ν is the frequency. The photoelectric effect, explained by Einstein in 1905, demonstrated the particle nature of light and established the photon concept.