What type of wave is a sound wave?
Longitudinal
Electromagnetic
Transverse

Which example proves light is faster than sound?
We see ripples in water after hearing a splash
We see lightning before hearing thunder
We hear lightning before seeing thunder

Which of these can happen to light waves?
Reflection and diffraction only
Reflection and refraction only
Reflection, refraction and diffraction

What is the law of reflection?
The angle of incidence is always greater than the angle of reflection
The angle of entry equals the angle of reflection
The angle of incidence equals the angle of reflection

What is dispersion?
The splitting of light into the colours of the rainbow
When waves spread out after passing through a gap
When waves change speed when they enter a new medium

Which colour of light is refracted the least?
Red
Green
Violet

What type of wave is a light wave?
Longitudinal
Transverse
Water

How do we calculate refractive index?
n = sin r ÷ sin i
n = sin i ÷ sin r
n = sin i × sin r

In which does light travel the fastest?
Glass
Water
Air

Through which medium does sound travel the fastest?
Solid
Liquid
Gas