Definition
Electromagnetic Spectrum is the entire range of electromagnetic radiation, classified by frequency or wavelength (gamma rays to radio waves).
Why It Matters
It represents the full bandwidth of physical information and communication channels.
Core Concepts
- The Spectrum: Includes Radio waves, Microwaves, Infrared, Visible Light, Ultraviolet, X-rays, and Gamma rays.
- How to read: “The speed c equals three hundred thousand kilometers per second.”
- Meaning: Universal speed limit for massless particles and EM waves in vacuum—all frequencies share this propagation speed.
- Interaction with Matter: