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12/16 Science
| Question | Answer |
|---|---|
| reflection | the bouncing of a sound wave off a surface |
| absorption` | The disappearance of a sound wave into a surface |
| vibration | a back and forth motion |
| compression | the part of a sound wave where molecules are crowded together. |
| frequency | the number of times an object vibrates per second |
| hertz | a unit for measuring frequency. One hertz equals the frequency of one vibation per second. |
| sound wave | a vibration that spreads away from a vibrating object |
| rarefaction | the part of a sound wave where molecules are spread apart |
| decibel | a unit that measures loudness |
| pitch | how high or low a sound is |
| echolocation | finding an object by using relected sound |
| sonar | SOund NAvigation and RANGING uses sound waves to detect objects far way |
| quality | the difference you hear between two sounds of the same loudness and pitch |
| echo | a reflected sound wave |
| How is sound produced? | vibrations |
| How does sound travel? | when a string vibrates, it makes molecules of gases in the air next to it vibrate. The molecules squeeze together, then spread apart.The vibration continues to spread and carries the energy away from the vibrating object outward in all directions |
| How do the different types of musical instruments make sound? | Brass - vibrates air Woodwinds - vibrate reeds Percussion -vibrating surface Strings-vibrte strings |
| How are pitch and frquency related? | the higher the frequency, the higher the pitch the lower the fequency the lower the pitch |
| What is the relationship between energy and the volume of sound? | |
| What kind of matter does sound travel through the best? | solid |
| What could cause a bridge to collapse as it has to do with the chapter. | resonance |
| What is the Doppler Effect? | a change in pitch of a moving sound like a siren or shistle |
| How is sound recorded on a compact disc? | CDs are made when computer translates the sound waves into a code. The code is a combination of 1s and 0s. Thn a laser beam uses the code to cut pits into a blank CD. |
| How does knowing the fundamental frequency of a building help the designers and builders of that building if they are construction that building in an earthquake zone? | It tells them how much the building will rattle or sway |
| Describe how sound is produced and travels from your mouth to your friends ear so they can hear it | Vocal cords in your throat vibrate when air moves past them allowing you to speak. the vibration spreads away from the vocal cords in a sound wave that carries it to the ear. The sound makes your ear vibrate and you hear. |
| The part of a sound wave where molecules are croded together is called the | compression |
| the part of a sound wave where molecules are spread apart is called the | rarefaction |
| a vibration that spreads away from a vibrating object is a | sound wave |
| the bouncing of a sound wave off a surface is called | reflection |
| the blend of the fundamental frequencies and overtones gives each sound its own | quality |
| to hear an echo you must have | a good reflective surface |
| when a string vibrates at the fundamental fequency sections of the string vibrate at a higer frequency called an | overtone |
| Pitch refers to | how high or low a sound is |
| a shorter string vibrates faster and produces a | high pitch |
| the pitch of a vibrating string is related to length and | thickness |
| the pitch of a person's voice varies with the length and thickness of | vocal cords |
| the number of times an object vibrates per second is its | frequency |
| a lower frequency produces a lower pitch and a higer frequency produces | a higher pitch |
| the back and forth distance that air molecules vibrate is based on how much | energy the sound wave carries |
| a louder sound has more energy than a | soft sound |
| on an oscilloscope a loud sound produces what king of waves | taller |
| on a CD sound is stored by a | computer code |
| in the first stepo of recording sound waves cause vibrations in the diapragm of a | microphone that produces an electric current |
| in the second step of sound being recorded what helps make a stronger current | an amplifi |
| finally when sound is recorded the electric current arranges the particles into | patterns on a blank tape |
| when a sound wave hits a surface some of its energy bounces or | reflects off the surface |
| some energy from the sound wave goes into the surface in the process called | absorption |
| how much energyof the sound is refelcted or absorbed depends on the dind of | material of the surface |
| a soft surface absorbs more sound than a | hard surface |
| in a concert all too much of this causes a hollow empty sound | reflection |
| when a music hall was built in the 1870s peoples clothing did what to the sound that did the styles of the 1930's | absorbed |
| a reflcted sound wave is called an | echo |
| in air at room temperture sound waves travel at a seed of | 343 meters per secnd |
| sound waves gnerally travel faster in | solid than in liquid or gas |
| the speed of sound waves depends largely on the | molecules of the material |
| temperature affects the speed of sound more in | gasses |
| sonar used these to detect faraway objects | sound waves |
| to measure ocean depths a sonar techniciation times how long it takes for sound wavs to bounce off a distant object and | RETURN |
| animals like whales, dolphins and bats use a form of sonar called | cholocation to find their way or locate food |
| as a siren or train whistle moves toward you, the pitch of the sound gets | higher |
| when a sound source moves toward you | the frequency of the sound increases |
| as the sound source moves away the sound waves spread, decreasing the | frequency and lowering the pitch |
| the change in frequency and pitch as a source of sound moves toward or away from you is known as the | doppler effect |
| the lowest frequency of any sound is its | fundamental frequency |
| the blend of the fundamental frequency and the overtones | producesd gives each sound its own quality |
| bridges have collapsed as a result of | resonance |
Created by:
elisenicole