Sound waves can travel through all sorts of mediums. The matter that transports the sound is called the medium. Did You Know? Dogs can hear sound at a higher frequency than humans, allowing them to hear noises that we can’t. We detect these vibrations by seeing and feeling them, but we do not hear them. Vibrations that are too slow for human hearing include ocean waves and earthquakes. One vibration too fast for human hearing is the ultrasonic signal emitted by bats for echo-locating. If a vibration is too fast or too slow, it will not be heard as “sound” by humans. Human ears sense vibrations within speeds between 20 – 20,000 vibrations per second.
Not all vibrations create sounds that humans can hear. Your ears vibrate in a similar way to the original source of the vibration, this then sends a message to your brain and the brain hears the sound, allowing you to hear many different sounds. Science of Sound: The vibrating air enters your ears and hits against your eardrums causing them to vibrate. Also, sound waves have special characteristics that make them unique. Irregular repeating sound waves create noise, while regular repeating waves produce musical notes. The same is true with sound and what happens with a popsicle harmonica. Picture a stone thrown into a still body of water. This very fast, back-and-forth motion is called a vibration. The sound you hear comes from its motion. As you stretch a rubber band and then pluck it, the rubber band moves back and forth so rapidly that its motion appears blurred.
A popsicle (craft stick) harmonica is a groovy way to demonstrate the science of sound because all sounds are produced by a certain kind of motion.
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