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17 Cards in this Set
- Front
- Back
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Pitch |
How high or low sound frequencies appear to be |
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Infrasonic |
Sound pitch too low to be heard by the human ear, that is, below 20 hertz |
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Ultrasonic |
Sound frequencies above 20,000 hertz, the normal upper limit of human hearing |
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Compression |
A pulse of compressed air (or other mater); opposite of rarefaction |
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Rarefaction |
A disturbance in air (or matter) in which the pressure is lowered. Opposite of compression |
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Natural Frequency |
A frequency at which an elastic object, once energized, will vibrate. Minimum energy is required to continue vibration at that frequency. Also called resonant frequency |
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Forced Vibration |
The vibration of an object that is made to vibrate by another vibrating object that is nearby. |
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Resonance |
When the frequency of a forced vibrations on an object matches the object's natural frequency, and a dramatic increase in amplitude occurs |
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Beats |
A periodic variation in the loudness of sound caused by interference when two tones of slightly different frequencies are sounded together |
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All sounds originate in the ______ of material objects |
Vibrations |
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As a source of sound vibrates, a series of _______________ travel outward from the source |
Compressions and rarefactions |
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Sound travels in |
Solids, liquids, and gases |
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The speed of sound in a gas depends on |
The temperature of the gas and the mass of the particles in the gas |
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The speed of sound in a material depends on |
The material's elasticity |
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Sound intensity is |
Objective and is measured by instruments |
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Loudness is a |
Physiological sensation sensed in the brain |
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An object resonates when |
There is a force to pull it back to its starting position and enough energy to keep it vibrating |
