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Chapter 26 sound f
N/A
| Question | Answer |
|---|---|
| ____________waves are produced by the vibrations of material objects. | sound |
| Sound waves consist of traveling pulses of high-pressure zones or ______________, alternating with pulses of low-pressure zones or ______________________________________. | compressions rarefactions |
| Sound can/can not travel through a vacuum. | CAN NOT |
| Sound travels fastest through very __________ materials, such as steel. | elastic |
| When a sounding board is forced to vibrate by a sound source, the sound becomes ____________________. | louder |
| When an object is forced to vibrate at one of its natural frequencies, resonance occurs and the sound becomes ____ _______. | much louder |
| Two sound waves can exhibit interference and make sound ___________ or _______________________. | louder softer |
| ________occur when two tones very close in frequency are heard at the same time. | Beats |
| A subjective impression about the frequency of sound is called _________. | pitch |
| Ultrasonic waves have frequencies _______________ 20,000 Hz. | above |
| Infrasonic sound waves have frequencies ___________ 20 Hz. | below |
| We can/ can not hear infrasonic and ultrasonic frequencies. | can not |
| In sound, a pulse of compressed air is called __________________. | compression |
| A disturbance in air in which the pressure is lowered is called a _____________________. | rarefaction |
| The transmission of sound does/ does not require a medium. | does |
| Rapid changes in loudness are known as ______________________. | beats |
| The vibration of an object that is made to vibrate by another vibrating object that is nearby is called _________________________. | forced vibration |
| A frequency at which minimum energy is required to produce forced vibrations. | Natural frequency |
| When the frequency of a forced vibration matches the object’s natural frequency a dramatic increase in amplitude occurs. This phenomenon is called _______________. | reasonance |
| What is the beat frequency when a262 Hz and a 272 Hz tuning fork are sounded together? | 10 beats per sec |
| . The speed of sound varies with | temperature. |
| The sound of beats is the sound of | throbbing tones. |
| When an object is set vibrating by a wave having a frequency that matches the natural frequency of the object, what occurs is | resonance. |
| A factory floor vibrates, and as a result you vibrate when standing on the floor. This is | forced vibration. |
| Sound does NOT travel in a | VACUUM |
| When you tap various objects, they produce characteristic sounds that are related to | their natural frequency. |
| Sound travels in air by a series of | both compressions and rarefactions. |
| 8. The pitch of a sound is most closely related to its | frequency |
| 9. Noise-canceling devices such as those in modern airplanes make use of sound | interference |
| 10. When the surface of a cello is made to vibrate, we say it undergoes | forced vibration. |
| what kind of vibrating source is a violin | strings |
| what kind of vibrating source is your voice | reed |
| what kind of vibrating source is saxophone | vocal cords |
| what kind of vibrating source is flute | column of your air mouth piece |
| sound waves are a type of _______ wave | longitudinally |
| as people grow older, they often have more trouble hearing sounds at the ______ end of the range of frequencies | higher |
| sound waves with the frequencies below the normal range are ______ waves | infrasonic |
| sound waves with the frequencies above the normal range are ______ waves. | ultrasonic |
| a pulse of compressed air is called _________, and a pulse of low pressure is called a ______. | compression rarefaction |
| for all wave motion it is not the _____ that travels but the _______ that travels | medium pulse |
| suppose a friend far away taps a metal fence circle the letter of the true statement | the sound is louder and travels faster through the metal than trough air |
| circle the letter of the best conductor of sound | solid |
| the speed of sound in a gas depends primarily on ______ and ________ | the temperature of the gas the mass of the particles in the gas |
| what is speed of sound in dry air at 0*C | 330m/s |
| ________in the air incthe square of the sound reases the speed of sound in air | water vapor |
| for each degree increase in the air temperature above 0*C,the speed od sound in air increase about ______ m/s | 0.60 |
| the speed of sound at normal room temperature is about | 340m/s |
| what is the intensity of sound proportional to? | the square of the amplitude of sound wave |
| does lighter gas transmit sound faster or slower than heavier gases found in air?_______ | faster |
| physiological hearing damage begins at exposure to ______ decibels. | 85 |
| what the properties upon which an object natural frequency depends | elasticity and shape |
| why is the sound made by an unmounted turning fork faint when fork faint when compared to the sound of the fork when its base is on a tabletop | the table is force to vibrate and it larger surface set more air in motion causing the loudness of the turning fork to increase |
| the part of any string musical instrument that undergoes forced vibration and makes the sound you hear is a _______ | sounding board |
| describe how child's c=swing illustrate resonance | the child pumps the swing or is pushed in rhythm with the natural frequency of swing increasing the amplitude of the swing |
| a ____ of a sound wave correspond to a crest of a transverse wave | compression |
| A ____ of a sound wave corresponds to trough of a transverse wave | rarefaction |
| when the crest of one wave overlap the crest of another wave,there is _______ interference and a decrease in _______ | constructive amplitude |
| when the crest of one wave overlaps the trough of another wave there is ____________ interference and a decrease in __________ | destructive amplitude |
Created by:
Roth
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