| A | B |
|---|
| Chuck Yeager | The first person to break the sound barrier |
| elasticity | The ability of a material to bounce back after being disturbed |
| the speed of sound depends on | The properties of the medium it travels through |
| intensity | The amount of energy a sound wave carries per second through a unit area |
| decibels | Units used to measure loudness or sound level |
| pitch | Term which refers to how high or low a sound seems to a person |
| ear canal | The part of your ear that sound waves enter through |
| viral or bacterial infections | Can cause hearing loss |
| ultrasound | Sound waves with frequencies above 20,000 Hz |
| echolocation | Method bats use to locate food and to navigate |
| diffraction | Allows you to hear sounds from around corners |
| infrasound | Sound waves with frequencies lower than the normal human hearing range |
| sonic boom | A huge amount of energy released in the form of a shock wave |
| beats | The repeating changes in loudness of two sound waves that are interfering |
| cochlea | A liquid-filled cavity in the inner ear |
| eardrum | Tightly stretched membrane in the ear canal |
| sonogram | Analyzes both the intensity and frequency of reflected ultrasonic waves |
| echo | A reflected sound wave |
| 0 dB | The loudness of a sound that can just barely be heard |
| timbre | Describes the quality of a sound you hear |
| interference | When two or more sound waves interact |
| bones in the middle ear | The hammer, anvil, and stirrup |
| Doppler effect | The changing pitch of a police car’s siren as it moves by you |
| fundamental tone | A sound wave of only one frequency |
| music | A set of tones combined and pleasing to the ear |
| acoustics | How well sounds can be heard in a particular room |
| aging | The most common type of hearing loss |
| sonar | A system of detecting reflected sound waves |
