Pitch is frequency: the higher the pitch the higher the frequency, and vice-versa.
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frequency = speed of wave / wavelength so if speed is constant then frequency varies inversely with wavelength
Wave frequency can be calculated by dividing the speed of the wave (if we're talking about electromagnetic waves in vacuum, that would be the speed of light, c) by wavelength.
The product of (wavelength x frequency) is the wave's speed.
Wavelength = 1/frequency. If you double the frequency, the wavelength drops to half.
The speed of any wave is the product of (wavelength) x (frequency) .