#2 Flashcards
(48 cards)
Sound def
Can travel through any solid, liquid, or gas
Sound will travel through solids ??
Fasted because the particles are all connected
Sound will travel through gasses ??
Easiest because the particles are small
Sounds are caused by what
By anything vibrating and causing molecules next to it to vibrate
More compression equals
High pressure
Rerefractiin equals
Low pressure
Eardrums feel pressure change and what
Send electrical signals to brain
Wavefrom def
A graph of the pressure changes cause by sound
Two types of times
1) pure tone
2) complex tone
Pure tone def
Only 1 tone is produced
Complex tone def
More than 1 tome @ the same time
Majority of Musical instruments are
Complex
Noise def
Random waveform
Does not repeat
Has no definite wavelength or frequency
People can hear what
20-20,000 Hz
Below 20Hz is called
Infrasound
-subwoofer
Above 20,000Hz is called
Ultrasound
- doh whistle
Sound propagation def
The movement of sound waves
The amplitude decreases as the wave
Expands
In open space, the amplitude is
Proportional to 1/d
Reverberation def
Process of repeated reflections of sound
Reverberant sound def
Sound heard after the original sound pulse
Reverberant time def
How long it takes for the sound amp to decrease by a factor of 1,000
Reverberation can cause
Distortion in sound
- sound and speech have pauses but reverberation can fill those pauses
Tone quality def
How a sound sounds
