Sound Wave Experiment

Materials: piece of paper, two metal spoons

Sound waves bounce off objects obstructing them causing an echo. To demonstrate that objects obstruct sound waves roll up a piece paper and hold the one side to your ear. Have someone stand behind you and hit two spoons together behind your left ear, your right ear, and above your head. The ear that has the paper held up to it will not be able to pick up the sound waves from the spoons being tapped above your head, so you will think it is coming from behind the unobstructed instead.