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| A scientific discipline – the study of hearing and hearing disorders. |
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Sound is a type of energy generated by vibrations & carried through the air in the form of pressure waves.
Hearing may take place only when these sound pressure waves reach the ear. |
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| The rate at which an object that is distorted returns to it’s original shape. |
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The tendency of an object to remain in its current motion state.
Example: Pendulum |
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| Rapid & random movement of air particles |
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A series of moving impulses set up by a vibration.
Vocal folds vibrate to create waves that we hear. |
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Portion of the sound wave where the molecules of the medium are forced together.
High pressure. |
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| To & fro movement of a mass. |
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The portion of the sound wave where the molecules become less densely packed.
Low pressure. |
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| Amplitude on vertical axis & time on horizontal axis. |
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| Amplitude on vertical axis & frequency on horizontal axis. |
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| Show frequency on the vertical axis, time on the horizontal axis and intensity reflected by the degree of darkness of the tracings. |
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Waves:
Transverse
Longitudinal
Sine |
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Definition
Transverse – A wave in which the motion of the molecules of the medium are perpendicular to the direction of the wave. Example: bobber moves up and down while waves move out.
Longitudinal – A wave in which the particles of the medium move along the same access as the wave. Sound waves are longitudinal. Air molecules move parallel to to the direction of the wave motion.
Waves and molecules move in the same direction.
Sine – The waveform of a pure tone showing simple harmonic motion. |
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| Complete sequence of events (condensation & rarefaction) of a single sine wave through 360o |
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| The # of complete oscillations of a vibrating body per unit of time. cps or hertz(Hz). |
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| The back & forth movement of a vibrating body. |
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| A tone of only one frequency. |
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| A wave representing simple harmonic motion that begins at 90o. |
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| Energy of a mass that results from its motion. |
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| Energy that results from a fixed& relative position. (Coiled spring). |
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Vibration of a mass independent of any external force.
Example:swinging of a pendulum
Damping – causing the vibrations to cease.
Example:stopping of the pundulum |
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Vibration of a mass controlled & maintained by and external impetus.
Example: puenulum in clock that has a motor |
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A sound that has all of its energy at one frequency, creating a pure tone.
Very rare
Created by tuning forks and pure-tone audiometers |
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Have energy at more than one frequency.
Human voice, musical instruments, & environmental noises. |
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Simplest kind of sound wave motion.
Also called simple harmonic motion. |
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| The wave created by simple harmonic motion. |
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