Question

answer the following questions. the information for these questions can be found on pp. 244 - 249. 1. what role does air pressure play in helping us to hear? 2. explain the relationship of frequency and pitch. 3. detail the process in which we convert sound waves to neural activity.

Explanation:

1. Sound is a pressure - wave. Air pressure variations create sound waves that enter the ear. These pressure changes vibrate the eardrum, which is the first step in the hearing process.
2. Frequency is the number of sound - wave cycles per second, measured in hertz (Hz). Pitch is the perceptual quality associated with frequency. Higher frequencies are perceived as higher - pitched sounds, and lower frequencies as lower - pitched sounds.
3. Sound waves enter the ear and cause the eardrum to vibrate. These vibrations are transmitted through the middle ear bones (ossicles) to the cochlea in the inner ear. In the cochlea, the vibrations cause the fluid to move, which in turn bends the hair cells. The bending of hair cells generates electrical signals (neural activity) that are sent to the brain via the auditory nerve.

Answer:

1. Air - pressure variations create sound waves that vibrate the eardrum, initiating the hearing process.
2. Frequency determines pitch. Higher frequencies are perceived as higher - pitched sounds, and lower frequencies as lower - pitched sounds.
3. Sound waves vibrate the eardrum, which are transmitted through the middle - ear bones to the cochlea. In the cochlea, fluid movement bends hair cells, generating neural activity sent to the brain via the auditory nerve.