Although all sound waves usually move at the same speed no matter their frequency, sometimes the sound waves separate by higher and lower frequencies when they move through something solid, like ice. They vibrate faster, or in other words, are higher frequency, than lower notes. It’s the perfect name, since longitudinal means “length,” and the waves move along the length of the slinky! They’re also called “compression waves,” as you can see the rings get compressed, or squeezed together. The rings get closer and further apart, making what scientists call “longitudinal waves,” which is illustrated with the dots in the diagram. Push the slinky forward, and watch how the waves travel through the slinky and back towards you. The diagram shows waves going up and down, but if you want to recreate sound waves more accurately, place a slinky horizontally on the floor. Sound moves in waves, similar to the diagram below. When the blade glides across the ice, it creates sounds made up of a mix of higher and lower pitches. Take a look at this video to hear singing ice: Have you ever heard a frozen lake sing? If you skate across a frozen lake, you may hear some incredibly eerie and beautiful sounds.
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