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Hearing and the Ear

Sound Waves. 2. Hearing and the Ear. The ear is a complex organ that can detect a wide range of sounds. . The ear can be divided into three parts—the outer ear, the middle ear, and the inner ear. . Sound Waves. 2. Hearing and the Ear.

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Hearing and the Ear

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  1. Sound Waves 2 Hearing and the Ear • The ear is a complex organ that can detect a wide range of sounds. • The ear can be divided into three parts—the outer ear, the middle ear, and the inner ear.

  2. Sound Waves 2 Hearing and the Ear

  3. Sound waves are gathered by the outer ear which is shaped to help capture the sound waves (energy transferred in particles of air) and send them through the ear canal, which transfers them to the eardrum.

  4. The vibrations of air particles cause the eardrum to vibrate.

  5. Pitch is the human perception of the frequency sound. If the vibrations follow each other slowly (low frequency) the sound is heard as a low pitch. If the vibrations follow each other in rapid succession (high frequency), the sound is heard as a high pitch.

  6. Sound waves with large amplitudes push on the eardrum with more force and are heard as loud sounds. Sound waves with small amplitudes push on the eardrum with less force and are heard as soft sounds.

  7. Vibrations from the ear drum are transmitted to three small bones of the middle ear, which transmit the vibrations to the inner ear.

  8. The vibrations in the liquid of the inner ear cause the tiny hairs to vibrate. The vibrating tiny hairs transmit the energy to nerves attached to the hairs. The nerve impulses are transmitted to the brain and interpreted as hearing.

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