Photon

Quantum of light and all other forms of electromagnetic radiation.

Core Principles & Analysis

• Einstein proposed light quanta in 1905 to explain the photoelectric effect.
• Travels at exactly 299,792,458 meters per second in vacuum.
• Compton scattering, observed in 1923, confirmed that photons carry momentum.

Specifications & Metrics

• MASS: 0
• SPIN: 1
• SYMBOL: γ