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A wavelength is the space between one wave and the next. Slow-moving sound waves have longer wavelengths. Fast-moving sound waves have shorter wavelengths.
The frequency of a sound wave is the speed of the vibration. Fast-moving sound waves create high frequency. Slow-moving sound waves create low frequency.
Think of the humming sound a fan makes when its blades turn. These are slower waves that produce a low frequency.
Objects that vibrate quickly produce short wavelengths with high frequencies. Think of the loud ringing sound a railroad crossing signal makes when a train is coming.
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