How sounds travel

1. READ/play the text
2. CLICK the picture (and video)
3. TRY this:

Q1: What happens when we pluck an elastic band?

[Answer]

Sounds have to travel through something. It's not an easy idea, because many sounds travel through the air, and air is invisible.

Space is silent because there is nothing for the sound to travel through.

Here we examine examples where we can see, or even feel, sound moving.