Which physical quantity is used to specify pitch in the human auditory system?

Which physical quantity is used to specify pitch in the human auditory system?

• A. Amplitude (dB).
• B. Time duration (seconds).
• C. Wavelength (meters).
• D. Frequency (Hz).

Answer: (D)

Pitch is set by the frequency of the sound wave. Higher frequencies produce higher perceived pitches, while lower frequencies produce lower pitches. In the ear, this is reflected by the basilar membrane, which is tonotopically organized: stiff areas at the base respond best to high frequencies and softer, more flexible regions toward the apex respond to low frequencies. Hair cells and their connected auditory nerve fibers encode these frequencies, with the brain interpreting the resulting neural patterns as pitch. Amplitude affects how loud a sound is, not how high or low it sounds, and duration affects how long the tone lasts rather than its pitch. Wavelength is related to frequency by the speed of sound, but pitch perception hinges on frequency itself. Therefore, frequency is the quantity used to specify pitch.

Pitch is set by the frequency of the sound wave. Higher frequencies produce higher perceived pitches, while lower frequencies produce lower pitches. In the ear, this is reflected by the basilar membrane, which is tonotopically organized: stiff areas at the base respond best to high frequencies and softer, more flexible regions toward the apex respond to low frequencies. Hair cells and their connected auditory nerve fibers encode these frequencies, with the brain interpreting the resulting neural patterns as pitch. Amplitude affects how loud a sound is, not how high or low it sounds, and duration affects how long the tone lasts rather than its pitch. Wavelength is related to frequency by the speed of sound, but pitch perception hinges on frequency itself. Therefore, frequency is the quantity used to specify pitch.