Electromagnetic waves include radio waves, microwaves, infrared, visible light, ultraviolet, X-rays and gamma rays and all travel at the speed of light. They can be described by their wavelength, energy and frequency and are used in technologies like radio, TV and microwaves. The electromagnetic spectrum ranges from long wavelength radio waves to highest frequency gamma rays.

1. Electromagnetic
Waves

2. When you listen to the radio, watch TV, or cook
dinner in a microwave oven, you are using
electromagnetic waves.

3. All electromagnetic waves move at the speed of
light.
Electromagnetic waves can be described by their
wavelength, energy, and frequency.

4. The electromagnetic spectrum includes, from
longest wavelength to shortest: radio waves,
microwaves, infrared, optical, ultraviolet, X-
rays, and gamma-rays.