Practice Question

1.Describe evidence that shows it is the wave which moves when ripples are seen on the surface of water. 

Ripples spread outward, but the water itself does not move away from the source.

If an object such as a cork is in the water and bobbing up and down, ripples move outwards, but the object bobbing up and down does not move with the wave

2.Describe evidence that shows it is the wave which moves when sound waves travel through the air

When someone speaks, sound waves travel through the air to the listener, but the air itself does not move from the speaker to the listener.

If air moved with the wave, wind would be created every time a sound is produced.