# Shared Flashcard Set

## Details

Chapter 26: Sound Questions
Chapter 26: Sound Questions
22
Physics
01/06/2012

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
 compressionsrarefactions
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
 loudersofter
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 objectâ€™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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