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39 Cards in this Set

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