Comparing light and sound waves

Light and sound both travel as waves, but they are not identical. The table summarises the similarities and differences between them:

LightSound
What type of wave is it?TransverseLongitudinal
Can they travel through a vacuum?YesNo. Sound waves can only pass through a solid, liquid or gas.
Can they be reflected?YesYes
Can they be refracted?YesYes
Can they be diffracted?YesYes
Can they interfere?YesYes

Diffraction is the spreading out of waves when they pass through a gap. The extent to which this happens depends on the wavelength and size of the gap.