Question

Like sound, light also cannot travel in a vacuum. True or false?

Answer 1

Sound

1. Sound waves are longitudinal waves.
2. It is a mechanical wave and cannot propagate without any medium.
3. Sound waves travel by the vibrating air particles through the space.

Light

1. Light is an electromagnetic wave.
2. Electromagnetic waves can propagate through space without any medium.
3. Continuous changing of the electric and magnetic vectors of electromagnetic wave (light) helps light to propagate without any medium.

So, light can travel in a vacuum but sound cannot.