The speed of light in glass is
20 km per second
200 000 km per second
2 million km per second
20 000 km per second

When light passes through a prism and split into different spectral colours it has undergone Diffusion
Diffraction
Dispersion
Interference

The speed of sound in concrete is around 5000 metres per second
330 metres per second
30 metres per second
1400 metres per second

Sound waves above 20 000HZ or just out of the range of human hearing are known as Ultrafast Waves
Ultrasonic Waves
XRays
Light Waves

Which of these materials has the highest refractive index of 2.42 ? Glass
Perspex
Diamond
Water

The ratio of the speed of light in a vacuum to the speed of light in a material is known as Reflective Index
Refractive Index
Relational Index
Dispersive Index

When identical waves overlap they may reinforce or cancel each other out this is known as Diffusion
Diffraction
Dispersion
Interference

The speed of light in a vacuum is 30 km per second
300 000 km per second
3 million km per second
30 000 km per second

The speed of sound in water is around 5000 metres per second
330 metres per second
30 metres per second
1400 metres per second

The speed of sound in air is around 5000 metres per second
330 metres per second
30 metres per second
1400 metres per second

