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 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.


    term for maximum displacement of a wave


    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 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 or False: Sound is a periodic wave train.


    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


    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.


    oen common measure of loudness

    one decibel

    the just noticeable difference, or the smallest difference a human ear can detect


    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


    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


    term for a sound of definite pitch produced by a singing voice or a musical instrument


    term for two notes with one twice the frequency of the other; heard as the same note at different levels

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