| A | B |
|---|
| sound | Form of energy produced by VIBRATIONS thru matter |
| wave length | The distance between 2 compressions |
| wave | A place where molecules in matter are disturbed [vibrate] |
| vibrate | To move back and forth |
| crest | The highest point of a wave |
| trough | The lowest point of a wave |
| pitch | The highness or lowness of a sound |
| low pitch [low sound] | The type of sound produced by fewer vibrations per second |
| high pitch [high sound] | The type of sound produced by more vibrations per second |
| compression wave | The area of wave with increased pressure [like a bunched up slinky] |
| rarefaction wave | area of a wave with decreased pressure [ stretched out slinky] |
| frequency | Number of vibrations per second |
| resonance | The strengthening of sound waves |
| sonar | sound waves underwater to find objects and the depth |
| echo | sound caused by the bouncing [reflection] of sound waves |
| humans and animals | These have vocal chords that vibrate to produce sound in the air and water |
| percussion instruments [drums] | Instuments in which the surface vibrates to produce sound |
| woodwinds [clarinet] | Instruments using air vibrating on reeds to produce sound |
| brass instruments [trumpet] | Instuments in which lips vibrating causes the air in tube to vibrate to produce sound |
| string instruments [violin] | Instruments in which vibrating strings produce the sound |
| Morse Code | vibrating telegraph wires use this to send messages |
| Hertz or kilohertz | Units used ot measure frequency |
| decibels | Units used to measure the loudness of sounds |
| Different animals hear different ranges of sounds than humans | Compare the hearing of animals to humans |
| solids [metal] | Sounds travel fastest thru this |
| longer wavelength | A lower frequency [lower pitch] has what kind of wavelength? |
| shorter wavelength | A higher frequency [higher pitch] has what kind of wavelength? |
| echolocation | Sound waves used by some animals to locate distant objects [bats and dolphins] |
| gas | Sound waves travel the slowest thru this |
| liquids | Sound waves travel thru this slower than solids, but faster than gas |
