Making Waves with Sound
But the best thing for sending sound waves along is a solid. Have you ever seen a movie where someone puts their ear to the ground to see if someone is following them? That’s because solid rock carries sounds faster and farther than air!
You can try this experiment with a friend. Find a long metal fence, and stand at either end of it. Put your ear to the fence, and have your friend tap the other end with a rock or stick. You should be able to hear the sound twice – once through the fence, and again through the air!
You can also hear that sounds are much louder in solids than in air. That’s why spies in movies will listen to a conversation though a wall by putting their ear against a glass. The solid glass makes the sound louder!
You can have some learning fun of your own with this simple experiment: Get in a bathtub (or something you can swim in), and
