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ch.16 SOUND vocab.
| Terms | Definition |
|---|---|
| Echo | a reflected sound wave. (sound waves reflect off objects, diffract through narrow openings and around barriers, and interfere with each other.) |
| Elasticity | the ability of a material to bounce back after being disturbed. t(he speed of sound depends in the elasticity, density, and temperature of the medium the sound travels through.) |
| Density | how much matter, mass, there is in a given amount of space, or volume. (The denser the medium, the more mass it has in a given volume.) |
| Loudness | describes your perception of the energy of a sound. (The loudness of a sound depends on two factors: the amount of energy it takes to make the sound and the distance from the source of the sound.) |
| Intensity | The amount of energy a sound wave carries per second through a unit area. (A sound wave of greater intensity sounds louder but as you move away from a sound source, loudness decreases because the intensity decreases.) |
| Decibel (db) | the loudness of different sounds is compared using a unit. |
| Pitch | a description of how high or low the sound seems to a person. (the pitch of a sound you here depends on the frequency of the sound wave) |
| ultrasound | sound waves with frequencies above the normal human range of hearing. |
| infrasound | sound with frequencies below the human rage of hearing. |
| larynx | two folds tissue that make up the human voice box, |
| Doppler effect | the change in frequency of a wave as it source moves in relation to an observer |
| what causes the Doppler effect? | when a sound source moves, the frequency of the waves changes because the motion of the source adds to the motion of the waves. |
| what causes the sonic boom? | a shock wave forms as the sound waves overlaps. (the shock wave releases a huge amount of energy. people nearby hear a loud noise the 'sonic boom' when the shock wave passes by them.) |
| Fudamental Tone | the lowest natural frequency of anobject. (a standind wave can occur only at specific frequencies that are called natural frequencies.) |
| overtone | the objects higher natural frequency .( overtones have frequencies that are two, three, or more times the frequency of the dudamental tone. |
| acoustics | the study of how sounds interact with each other and the eviroment. |
| reverberation | the echos of a sound that are heard after a sound source stops producing sound waves. |
| ear canal | it collects sound waves and directs them into a narrow region.( your ear canal is a few cenemiters long and ends at the eardrumb.) |
| eardrum | a small, tighty streched, drumlike membrance.( the sound waves make your erdrum virbrat, just as a drum vibrates when you strike it.) |
| cochlea | a fluid- filled cavity shaped like a snail shell.( it contains more then 100,000 tiny structures called hair cells.) |
| echolocation | the use of reflected sound waves to determine distances or to locate objects. |
| sonar | a system thnat uses reflected sound waves to detect and locate objects underwate. |
| sonogram | the device uses the reflected ultrasound waves to creat a picture. |
Created by:
ka.r.la
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