It’s a planet of sound! Sound starts with just a simple vibration. It’s at the heart of everything from One Direction’s latest song to the conversations you have with friends. But how does sound work? What turns the motions of molecules into the symphonic sounds of orchestras, whistling tea kettles, and barking dogs? Let’s explore the phenomenal world of sound and vibration—and how this natural phenomenon is used for communication and even navigation. Sound good?
Sound is an invisible form of energy. Most animals have the ability to sense it. Along with sight and smell and the skin’s ability to sense temperature, our sense of hearing tells us what’s happening outside our bodies. It can tell us what’s happening far away and out of sight—and it’s a powerful form of communication. Think about a lion roaring or someone crying for help.
3 Topics in this unit
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Sound Waves
It’s a planet of sound! Sound starts with just a simple vibration.
- 900L-1040L
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Free
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Pitch, Loudness, and Timbre
Pitch is all the different notes of the “song” of life as heard by humans ...
- 900L-1040L
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Free
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Echoes, Ultrasound, and Sonar
Everybody has heard an echo.
- 900L-1040L
