| A | B |
|---|
| how high or low a sound is | pitch |
| to move back and forth rapidly | vibrate |
| how loud or soft a sound is | loudness |
| vibration that carries sound energy through matter | sound wave |
| unit used to measure frequency | hertz |
| unit used to measure loudness or softness | decibel |
| reflected sound | echo |
| number of times an object vibrates per second | frequency |
| Three ways to change pitch | tension, length, and thickness |
| the average loudness of the spoken word | 60 decibels |
| the area where the molecules are spread apart | rarefaction (trough) |
| any sound over 20,000 hz | ultrasound |
| sound created when an object moves faster than the speed of sound | sonic boom |
| the top part of a wave | crest |
| the measurement between two crests or two troughs of a wave | wavelength |
| the point at which permanent hear loss can occur | 120 hz |
| the use of sound to determine depth, size and shape of underwater objects | SONAR |
| any sound below 20 hz | infrasound |
| use of sound to find food by bouncing sound off of objects | echolocation |
| the area where molecules are close together | compression (crest) |
| three forms of matter | solid, liquid, gas |
| place where no sound can be heard | vacuum (space) |
| lowest point of a wave | trough |
| sound with no pattern or definite pitch | noise |
| high frequencies have what kind of wavelength? | short wavelengths (close together) |
| as thickness increases, pitch_____________ | decreases (gets lower) |
| through which medium does sound travel the fastest? | solids |
| as tension increases, the pitch _________ | increases (gets higher) |
| increase of pitch and intensity of a sound as an object moves closer | doppler effect |
| As length decreases, the pitch _____________ | decreases (gets lower) |
| A soft sound has a ________ amplitude | small (short) |
| low frequencies have ___________ wavelengths | long |
