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Chapter 26: Sound Questions
Chapter 26: Sound Questions
22
Physics
11th Grade
01/06/2012

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Term
____________waves are produced by the vibrations of material objects.
Definition
Sound
Term
Sound waves consist of traveling pulses of high-pressure zones or ______________, alternating with pulses of low-pressure zones or ______________________________________.
Definition
compressions
rarefactions
Term
Sound can/can not travel through a vacuum.
Definition
can not
Term
Sound travels fastest through very __________ materials, such as steel.
Definition
elastic
Term
Every object vibrates at its own set of natural __________________.
Definition
frequencies
Term
When a sounding board is forced to vibrate by a sound source, the sound becomes ____________________.
Definition
louder
Term
When an object is forced to vibrate at one of its natural frequencies, resonance occurs and the sound becomes ____ _______.
Definition
much louder
Term
Two sound waves can exhibit interference and make sound ___________ or _______________________.
Definition
louder
softer
Term
________occur when two tones very close in frequency are heard at the same time.
Definition
Beats
Term
A subjective impression about the frequency of sound is called _________.
Definition
pitch
Term
Ultrasonic waves have frequencies _______________ 20,000 Hz.
Definition
above
Term
Infrasonic sound waves have frequencies ___________ 20 Hz.
Definition
below
Term
We can/ can not hear infrasonic and ultrasonic frequencies.
Definition
can not
Term
In sound, a pulse of compressed air is called __________________.
Definition
compression
Term
A disturbance in air in which the pressure is lowered is called a _____________________.
Definition
rarefaction
Term
The transmission of sound does/ does not require a medium.
Definition
does
Term
Rapid changes in loudness are known as ______________________.
Definition
beats
Term
The vibration of an object that is made to vibrate by another vibrating object that is nearby is called _________________________.
Definition
forced vibration
Term
A frequency at which minimum energy is required to produce forced vibrations.
Definition
Natural frequency
Term
When the frequency of a forced vibration matches the object’s natural frequency a dramatic increase in amplitude occurs. This phenomenon is called _______________.
Definition
reasonance
Term
To determine the # of beats heard between two frequencies. Subtract the frequencies. What is the beat frequency when 262 Hz and 266 Hz tuning forks sound together?
Definition
4 beats/second
Term
What is the beat frequency when a262 Hz and a 272 Hz tuning fork are sounded together?
Definition
10 beats/second
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