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ch 21 quiz
| Question | Answer |
|---|---|
| the complete back and forth motion of an object | vibration |
| what is sound created by? | vibrations |
| a logitudinal wave caused by vibrations and carried through a substance | sound wave |
| sound is transmitted through the --- and --- of particles | vibrations and collisions |
| in what directions do sound waves travel from their source? | all directions |
| a substance through which a wave can travel | medium |
| does sound require a medium? | no |
| study diagram of the ear | study diagram of the ear |
| what does the speed of sound depend on? | the medium it is traveling through |
| cooler medium = --- sound | slower |
| how high or low a sound seems to be | pitch |
| the number of crests or troughs that are made in a given amount of time | frequency |
| are pitch and frequency related? | yes |
| what is the doppler effect? | the apparent change in the frequency of a sound caused by the motion eiether the listener or the source of the sound |
| a measure of how well a sound can be heard | loudness |
| the largest distance the particles in a wave vibrate from their rest postion | amplitude |
| larger amplitude = --- sound | louder |
| what is the unit used to measure sound? | decibel |
| what does an oscilloscope do? | graphs representations of sound waves |
| bouncing back of a wave after it strikes a barrier | reflection |
| what is a reflected sound wave called? | echo |
| what do sounds best reflect off of? | smooth, hard surfaces |
| the process of using reflected sound waves to find objects | echolocation |
| what types of animals use echolocation? | bats, dolphins, abd beluga whales |
| what does SONAR stand for? | sound navigation and ranging |
| what is something that break the sound barrier? | a jet |
| when two or more waves overlap | interference |
| the explosive sound heard when a shock wave reaches your ears | sonic boom |
| a pattern of vibration that looks like a wave that is standing still | standing wave |
| frequencies at which waves are made | resonant frequencies |
| lowest resonant frequecy= | fundemental frequency |
| higher resonant frequencies= | overtones |
| when an object vibration at or near a resonant frquency of a second object causes the second object the vibrate | resonance |
| the result of several pitches mixing together through interference | sound quality |
| what are the 3 types of instruments? | string,wind, and percussion |
| what are the 2 groups of wind instruments? | woodwinds and brass |
| any sound that is a random mix of frequencies | noise |
Created by:
kfran0112
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