Waves can be categorized into two broad types:
Mechanical waves
- those requiring a medium (something for the wave energy to "travel through", like air, water or steel)
Electromagnetic waves (EM)
- waves that do not require a medium. These waves can travel in a vacuum. This type includes visible light, x-rays, gamma rays, microwaves, radio waves, IR and UV. More about these to come when we get to light.
Also, all EM waves travel (in a vacuum) at the speed of light, c.
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