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39 Cards in this Set
- Front
- Back
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A measure of force is
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PRESSURE
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What can increase pressure?
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SMALLER VOLUME, MORE MOLECULES, TEMPERATURE
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What type of wave is a sound wave?
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LONGITUDINAL
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Can sound travel through space?
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NO (no air)
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What does a sound wave look like?
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BANDS OF HIGH AND LOW PRESSURE
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What creates a sound wave?
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ANYTHING THAT VIBRATES AIR
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The unit for the loudness of sound is a
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DECIBEL (dB)
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What part of a wave is most closely related to volume?
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AMPLITUDE
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How is amplitude seen in a sound wave?
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MORE DENSE BANDS OF HIGH PRESSURE
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How many times louder is a sound that is 20 dB compared to one that is 0 dB
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TWO TIMES LOUDER
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What decibel level is a whisper?
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10
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What decibel level is normal talking?
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65
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What decibel level will cause pain?
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120
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The science and technology of sound is
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ACOUSTICS
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What techniques might be used in acoustics?
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SOUNDPROOFING, REVERBERATION
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What causes a difference pitch?
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FREQUENCIES
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High pitches, like a high note on a piano has a __ frequency.
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HIGH
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Low pitches, like the rumble of thunder, has a __ frequency.
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LOW
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As frequency increases, wavelength...
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DECREASES
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Thunder will have a __ wavelength compared to a high note on the piano.
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LONGER/LARGER
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True or False: Most sounds we hear are made up of single frequencies.
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FALSE
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Voices generally fall in what range of frequency?
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100 to 2000 Hz
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A graph showing frequency changes and amplitude of sounds over time is a
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SONOGRAM
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Darker areas on a sonogram mean greater...
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AMPLITUDE (VOLUME)
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A mixture of all frequencies of sound is called...
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WHITE NOISE
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Resonance causes sound to become
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LOUDER
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How does a musical instrument create a shorter wavelength sound?
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SHORTER STRING/PIPE
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How does a musical instrument create a higher frequency sound?
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SHORTER STRING/PIPE
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What is the average speed of sound?
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340 m/s
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Speeds faster than the speed of sound are called
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SUPERSONIC
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What factors can cause a change in the speed of sound?
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TEMPERATURE, DENSITY/PRESSURE, MATERIAL
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What type of material does sound travel fastest through?
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SOLIDS
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What type of temperature does sound travel fastest through?
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WARM
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What type of pressure does sound travel fastest through?
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HIGH
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Mutliple echoes are called
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REVERBERATION
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Areas of __ interference caused by reverberation are called __.
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DESTRUCTIVE; DEAD SPOT
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Why is reverberation used?
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TO INCREASE VOLUME WITHOUT ELECTRONICS
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The bending of a sound wave through a crack in the door is
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DIFFRACTION
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How many times greater is the amplitude of a wave created by 20 dB than one created by 0 dB
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TEN TIMES GREATER
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