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simplest waveform, represents a pure tone, one that contains only a single frequency of vibration
the variation of the amplitude of the sound energy plotted against the duration of the sound
the average intensity maintained while the sound source continues to supply energy to generate vibrations in the surrounding air
Period during which source supplies energy to maintain sound. Typically, very long--1 second to several minutes
Time required for sound to drop from sustaining level to inaudibility. May be very short or very long. Affected by reverberance of environment.
projects the voice forward, but does not enhance weaker pressure waves, which dissipate rapidly
change in the apparent frequency of a wave as observer and source move toward or away from each other
Direct Current (DC)
electric current that flows in a single direction, from the negative terminal to the positive terminal of a battery when connected to an external circuit
free electrons move through circuit from negative terminal of voltage source, through circuit, returning to the positive terminal of the source
source of electrical pressure
the force which frees electrons from atoms, causing concentration of positive ions at one terminal of source and concentration of electrons at opposite terminal. Force used to separate electrons and ions is usually chemical (battery) or magnetic (generator)
any element which restricts passage of electrons thereby limiting the flow of current through the circuit
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