Interference Dispersion Diffusion Diffraction
1400 metres per second 30 metres per second 5000 metres per second 330 metres per second
Water Diamond Glass Perspex
Light Waves X-Rays Ultrafast Waves Ultrasonic Waves
Dispersive Index Relational Index Reflective Index Refractive Index
30 000 km per second 3 million km per second 30 km per second 300 000 km per second
20 000 km per second 2 million km per second 20 km per second 200 000 km per second