What you'll learn
The electromagnetic spectrum and the behaviour of light.
The EM spectrum
- Order (increasing frequency): radio, microwave, infrared, visible, ultraviolet, X-ray, gamma.
- All travel at the speed of light in a vacuum; uses and dangers of each.
Light
- Reflection (angle in = angle out) and refraction (bending at a boundary).
Exam tips
- Learn the spectrum order and one use for each region.
- Match dangers to the high-frequency waves (UV, X-ray, gamma).
Common mistakes
- Getting the spectrum order wrong.
- Confusing reflection and refraction.