Why can light travel but sound can't?

Answer by  cubedbee (155)

Sound does travel, if it didn't, you couldn't hear anything. Sound can't travel through a vacuum, unlike light, because sound needs physical units like air molecules to travel in.

Answer by  sususu (866)

Sound does travel, and it travels more slowly than light but still travels quickly. Unlike light, the speed of sound isn't constant but depends on the medium it's traveling through. Because sound travels, you can hear noises from far away grow closer to you, an effect known as the Doppler effect that we experience every day.