The number of complete wavelengths in a given unit of time is called frequency (f). As a wavelength increases in size, its frequency and energy (E) decrease. From these equations you may realize that as the frequency increases, the wavelength gets shorter . As the frequency decreases, the wavelength gets longer.
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The shorter the wavelength , the higher the frequency, and the higher the pitch, of the sound. In other words, short waves sound high; long waves sound low.
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