Chapter 17 Test
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Created by:
ActingAllie on February 28, 2010
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Description:
Ms. Reid MPCS 6th grade
Classes:
mpcs 6th graders who rock!!!!, MPCS 6th grade geography, Country Music Fans!, MPCS Advanced Language Arts, Mount Paran 6th grade to study
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39 terms
Terms | Definitions |
|---|---|
 loudness | The human perception of how much energy a wave carries |
| echolocation | A system of using echoes to navigate and hunt |
| pitch | How high or low a sound is |
| reverberation | Repeated echoes of sound |
| amplitude | The amount of energy in a sound wave (loudness) |
| resonance | When an object is made to vibrate at its natural frequencies by absorbing energy from a sound wave or another vibrating object at these frequencies |
| diffraction | Bending of waves around a barrier |
| natural frequency | The frequency at which a certain object will vibrate |
| compressional wave | A type of mechanical wave made of a series of compressions and rarefactions, in which matter in the medium moves forwards and backwards along the direction the wave travels |
| rarefaction | A group of molecules that are farther apart (less dense) |
| echo | A reflected sound wave |
| compression | A group of molecules that are closer together (more dense) |
| sonar | A method of mapping underwater by using sound waves (underwater echolocation) |
| 343 m/s | Speed of sound in air at 20 degrees Celcius |
| decibel | The unit to measure the loudness of a sound |
| Doppler Effect | the change in frequency that occurs when a source of sound is moving relative to a listener |
| vibrations | What causes sound? |
| mechanical compressional | What kind of wave is sound? |
| 85 decibels | When does hearing damage start? |
| echolocation | How do bats navigate? |
| repeated rythmic pattern | music has a _________ ___________ ___________ |
| hertz | unit to measure frequency |
| strings | what vibrates in a guitar |
| strings | what vibrates in a piano |
| lips | what vibrates in a brass instrament |
| reed | what vibrates in a clarinet |
| vocal chords | what vibrates in your voice |
| lower | thicker strings create __________ sounds than thin |
| collecting sound | The outer ear is responsible for |
| interpreting sound | The inner ear is responsible for |
| amplifying sound | The middle ear is responsible for |
| longer | to decrease the pitch of a trombone you make the air column __________ |
| higher | The _________ the temperature the higher the speed of sound |
| energy | What do waves carry? |
| size shape material | The frequency of an object is affected by __________, _________, and _________. |
| padding | You can control the reverberation in a room by ________ the walls and other objects in the room. |
| exact | In order for an opera singer to shatter a glass they have to sing the _________ natural frequency of the glass |
| absorb | glasses wil __________ energy causing it to vibrate until it broke |
| medium | There isn't a __________ in space therefore there is no sound! |
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