| A | B |
|---|
| eardrum | tough membrane in the outer ear that is about 0.1 mm thick and transmits sound vibrations in the middle ear |
| cochlea | spiral-shaped, fluid-filled structures in the inner ear that converts waves to nerve impulses |
| intensity | amount of energy that flows through a certain area in a specific amount of time |
| loudness | human perception of sound intensity |
| decibel | unit for sound intensity; abbreviation dB |
| pitch | how high or low a sound seems; related to the frequency of the sound waves |
| ultrasonic | sound waves with frequencies above 20,000 Hz |
| Doppler effect | change in pitch or frequency that occurs when a source of a sound is moving relative to a listener |
| music | sounds that are deliberately uses in a regular pattern |
| sound quality | difference between sounds having the same pitch and loudness |
| overtone | vibration whose frequency is a multiple of the fundamental frequency |
| resonator | hollow, air-filled chamber that amplifies sound when the air inside it vibrates |
| acoustics | the study of sound |
| echolocation | process in which objects are located by emitting sounds and interpreting sound waves that are reflected |
| sonar | system that uses the reflection of sound waves to detect objects underwater |
