| A | B |
|---|
| Echo | a reflected sound wave |
| Elasticity | the ability of a material to bounce back after being disturbed |
| Density | the ratio of a mass of a substance to its volume |
| Loudness | perception of the energy of a sound |
| Intensity | the amount of energy per second carried through a unit area by a wave |
| Decibel (dB) | a unit used to compare the loudness of different sounds |
| Pitch | perception of the frequency of a sound |
| Ultrasound | sound waves with frequencies above 20,000 Hz |
| Infrasound | sound waves with frequencies below 20 Hz |
| Larynx | two folds of tissue that make up the human voice box |
| Doppler Effect | the change in frequency of a wave as its source moves in relation to an observer |
| Music | a set of tones and overtones combines in ways that are pleasing |
| Fundamental Tone | the lowest natural frequency of an object |
| Overtone | a natural frequency that is a multiple of the fundamental tone’s frequency |
| Acoustics | the study of how sounds interact with each other and the environment |
| Reverberation | the echoes of a sound that are heard after a sound source stops producing sound waves |
| Ear Canal | a narrow region leading from the outside of the human ear to the eardrum |
| Eardrum | a small, tightly stretched, drum-like membrane in the ear |
| Cochlea | a fluid filled cavity in the inner ear that is shaped like a snail shell |
| Echolocation | the use of reflected sound waves to determine distances or to locate objects |
| Sonar | a system that uses reflected sound waves to detect and locate objects underwater |
| Sonogram | an image formed by using reflected ultrasound waves |
