| A | B |
|---|
| Wave | a disturbance that transmits energy through matter or space |
| Medium | a substance through which a wave can travel |
| Outer ear | the part of the ear that acts as a funnel to direct sound waves into the middle ear |
| middle ear | the middle part of the ear where the amplitude of sound vibrations is increased |
| inner ear | the part of the ear where vibrations created by sound are changed into eletrical signals for the brain to interpet |
| infrasonic | the term desribing sound with frequencies lower than 20 Hz |
| ultrasonic | the term describing sound with frequencies higher than 20,000 Hz |
| doppler effect | the apparent change in the frequency of a sound caused by the motion of either the listener or the source of the sound (refers to sound only) |
| loudness | How long or soft a sound is perceived to be |
| decibel | the most common unit used to express loudness |
| Reflection | the bouncing back of a wave after it strikes a barrier or an object |
| echo | a reflected sound wave |
| echolocation | the process of using reflected sound wave to find objects |
| interference | a wave interaction that occurs when two or more waves overlap and combine |
| sonic boom | the explosive sound heard when a shock wave from an object traveling faster than the speed of sound reaches a person's ear |
| standing wave | a wave that forms a pattern in which portions of the waves do not move and other portion move with a large amplitude |
| resonance | what occurs when an object vibrating at or near a resonant frequency of a second object causes the second object to vibrates |
| diffraction | the bending of waves around barriers or through openings |
| sound quality | the result of several pitches blending together through interference |
| noise | any undesired sound especially a nonmusical sound, that includes a random mix of pitches |
