34 terms

Abeka Physics Chapter 17

This set covers A Beka Book Physics Chapter 17: "Sound" (pages 252-265).
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sound
term for the movement of longitudinal waves through an elastic medium, whether solid, liquid, or gas
True
True or False: No sound can travel through a vacuum.
elastic medium
Although gas particles are not held together by elastic force, they form a(n) ____ ____ that resists any departure from uniform pressure.
amplitude
term for maximum displacement of a wave
equilibrium
term for a molecule's original position
displacement wave train
term for the undulating variation in displacement of molecules along the path of a sound wave
True
True or False: Sound travels in a longitudinal wave.
hardness, density, and temperature
three factors that affect the speed of sound
Doppler effect
term for any shift in the wavelength and frequency of waves due to motion of the source (or to motion of the observer)
positive, negative
For the Doppler equation, any motion of one toward the other is ____, and any motion of one away from the other is _____.
supersonic speed
term for a speed past that of sound; breaking the sound barrier
Mach numbers
numbers used to related the speed of jets to the speed of sound
shock wave
term for a violent disturbance traveling outward, that occurs when an object breaks the sound barrier
sonic boom
term for the sound heard when a shock wave sweeps over listeners at ground level
True
True or False: Sound is a periodic wave train.
intensity
term for the amount of energy flowing per unit time through a unit area at right angles to wave motion; quantity that represents the strength of sound
threshold of hearing
term for the intensity detectable by a person with normal hearing
loudness
term for the human perception of intensity
nonlinear receiver
The ear is a(n) _____ ____ of sound intensity; that is, the perceived loudness of a sound is not a simple linear function of intensity measured in W / meters squared
relative intensity
Loudness is a measure of ____ ____; specifically, a relationship of one sound to a barely audible sound.
order of magnitude
Scientific studies have shown that perceived loudness is determined, not by absolute intensity, but by the ___ __ _____ of absolute intensity.
decibel
oen common measure of loudness
one decibel
the just noticeable difference, or the smallest difference a human ear can detect
pitch
term for our perception of audible frequency
Savart's wheel
term for a toothed disk that demonstrates pitch as it spins on its axis
sonic waves
another term for sound waves
mean free path
term for the average distance of travel between collisions
audio spectrum
term for the range of frequencies or wavelengths that can be heard
ultrasonic waves
term for sonic waves with frequencies above 20,000 Hz, the upper limit of the audio range
infrasonic waves
term for sonic waves below 20 Hz, the lower limit of audible sound
cavitation
When passed through a liquid, ultrasound at high intensity causes _____, the formation of cavities.
ultrasonic tomography
term for a versatile procedure that can find tumors and gallstones or show a developing child within the womb
note
term for a sound of definite pitch produced by a singing voice or a musical instrument
octave
term for two notes with one twice the frequency of the other; heard as the same note at different levels
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