Help
Options
Didn't know it?
click below
click below
Knew it?
click below
click below
Don't Know
Remaining cards (0)
Know
retry
shuffle
restart
0:00
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.
Normal Size Small Size show me how
Normal Size Small Size show me how
Chapter 21 Quest
Chapter 21 notes compiled for the quest
| Question | Answer |
|---|---|
| all sounds are created by _____ | vibrations |
| what are vibrations? | the complete back and forth movement of an object |
| what is the most common sound medium? | air |
| what does the speed of sound depend on | the medium |
| how does temperature affect sound? | high temp=faster speed |
| how high or low a sound seems | pitch |
| what is the human range of sounds we can hear? | 22-20,000 Hz |
| the apparent change in frequency of sound caused by the motion of either the listener or the sound source | Doppler effect |
| in a moving sound source, which wave do waves move | in the direction of the object |
| in a moving sound source, what does the person in front hear, and what does the person behind hear? | in front, high, in back, low |
| why? | after the objects passes, the waves are moving in the opposite direction than the moving sound waves |
| measure of how well a sound can be heard | loudness |
| the common unit to express loudness | decibel |
| what is the symbol for decibel? | dB |
| on an oscilloscope, what parts represent rarefactions and compressions? | crests=compressions, troughs=rarefactions |
| why do we use oscilloscopes to see sound waves? | they are graphed as transverse waves, and you can quickly see the amplitude and frequency |
| a reflected sound wave | an echo |
| the use of reflected sound waves to find an object | echolocation |
| what can sonar do? | help avoid icebergs, map ocean floor |
| what can see inside a body without surgery? | ultrasonography |
| to faster than the speed of sound, what must happen? | breaking of the sound barrier |
| sound heard when shock wave reaches ears | sonic boom |
| outer edges combine with constructive interference to form shock wave | |
| pattern of vibration that looks like it is standing still | standing wave |
| the lowest resonant frequency is called the: | fundamental |
| high resonant frequencies are called: | overtones |
| what do standing waves do to sound? | amplify it |
Created by:
Tsarmina
Popular Physical Science sets