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the lower the frequency the lower the pitch; higher pitch lower frequency
Pitch is frequency: the higher the pitch the higher the frequency, and vice-versa.
We measure pitch with frequency and volume with amplitude.
Although the response of the human ear varies from individual to individual and also changes with age, the range of hearing is 20 Hz with maximum sensitivity between 200-400hz. Pitch refers to the sensation of increase or decrease of frequency.
Nothing, as the speed of sound doesn't change (about 340 metres per second in air). If the frequency (or pitch) were to be twice as high it would simply halve the wavelength.