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Chapter 26 sound f
|____________waves are produced by the vibrations of material objects.
|Sound waves consist of traveling pulses of high-pressure zones or ______________, alternating with pulses of low-pressure zones or ______________________________________.
|Sound can/can not travel through a vacuum.
|Sound travels fastest through very __________ materials, such as steel.
|When a sounding board is forced to vibrate by a sound source, the sound becomes ____________________.
|When an object is forced to vibrate at one of its natural frequencies, resonance occurs and the sound becomes ____ _______.
|Two sound waves can exhibit interference and make sound ___________ or _______________________.
|________occur when two tones very close in frequency are heard at the same time.
|A subjective impression about the frequency of sound is called _________.
|Ultrasonic waves have frequencies _______________ 20,000 Hz.
|Infrasonic sound waves have frequencies ___________ 20 Hz.
|We can/ can not hear infrasonic and ultrasonic frequencies.
|In sound, a pulse of compressed air is called __________________.
|A disturbance in air in which the pressure is lowered is called a _____________________.
|The transmission of sound does/ does not require a medium.
|Rapid changes in loudness are known as ______________________.
|The vibration of an object that is made to vibrate by another vibrating object that is nearby is called _________________________.
|A frequency at which minimum energy is required to produce forced vibrations.
|When the frequency of a forced vibration matches the object’s natural frequency a dramatic increase in amplitude occurs. This phenomenon is called _______________.
|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
|The sound of beats is the sound of
|When an object is set vibrating by a wave having a frequency that matches the natural frequency of the object, what occurs is
|A factory floor vibrates, and as a result you vibrate when standing on the floor. This is
|Sound does NOT travel in a
|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
|9. Noise-canceling devices such as those in modern airplanes make use of sound
|10. When the surface of a cello is made to vibrate, we say it undergoes
|what kind of vibrating source is a violin
|what kind of vibrating source is your voice
|what kind of vibrating source is saxophone
|what kind of vibrating source is flute
|column of your air mouth piece
|sound waves are a type of _______ wave
|as people grow older, they often have more trouble hearing sounds at the ______ end of the range of frequencies
|sound waves with the frequencies below the normal range are ______ waves
|sound waves with the frequencies above the normal range are ______ waves.
|a pulse of compressed air is called _________, and a pulse of low pressure is called a ______.
|for all wave motion it is not the _____ that travels but the _______ that travels
|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
|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
|________in the air incthe square of the sound reases the speed of sound in air
|for each degree increase in the air temperature above 0*C,the speed od sound in air increase about ______ m/s
|the speed of sound at normal room temperature is about
|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?_______
|physiological hearing damage begins at exposure to ______ decibels.
|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 _______
|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
|A ____ of a sound wave corresponds to trough of a transverse wave
|when the crest of one wave overlap the crest of another wave,there is _______ interference and a decrease in _______
|when the crest of one wave overlaps the trough of another wave there is ____________ interference and a decrease in __________