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