light

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• Electromagnetic Spectrum
  The continuous range of electromagnetic radiation from radio waves to gamma rays, classified by frequency and wavelength.
• Doppler Effect
  The change in the observed frequency of a wave when the source and the observer move relative to each other.
• Wave–Particle Duality
  The quantum-mechanical fact that entities such as light and electrons exhibit both wave-like and particle-like behavior depending on the experiment.
• Special Relativity
  Einstein's 1905 theory of space and time, built on the constancy of the speed of light and the equivalence of all inertial frames.