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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 |