When the pitch of sound increases, which one of the following increases?

Pitch is the perceptual attribute of sound that allows listeners to order tones from low to high. It is directly determined by the frequency of the sound wave, which is the number of oscillations or cycles per second measured in Hertz (Hz). When the pitch of a sound increases, it is because the frequency of the vibration has increased. There is a direct correlation where higher frequency leads to a higher perceived pitch. Conversely, wavelength is inversely proportional to frequency; as frequency (and thus pitch) increases, the wavelength of the sound wave decreases. Intensity and loudness are related to the amplitude of the wave rather than its pitch. Therefore, an increase in pitch corresponds specifically to an increase in frequency.