Physics for IGCSE & O level - Waves And Sounds (Section 6 - No. 10)

What is a key difference between sound waves and light waves?

Sound waves are transverse, light waves are longitudinal.

Sound waves require a medium, light waves do not.

Sound waves travel faster than light waves.

Sound waves can travel in a vacuum.

Sound waves require a medium to travel, whereas light waves can travel through a vacuum.