1. Electromagnetic Spectrum
2. What is the electromagnetic spectrum? It contains waves with the same speed but different frequencies and wavelengths, organized from high to low (frequency).
What is it made up of?
Radio waves, microwaves, infrared rays, visible light, ultraviolet light, X-rays, and gamma rays
3. What are radio waves? They are waves with the longest wavelength and lowest frequency. Examples: radios, antenna, radio tower