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25 Cards in this Set

  • Front
  • Back
Natural Frequency
Frequency at which an elastic object naturally tends to vibrate if it is disturbed and the disturbing force is removed.
Digital Audio
Audio reproduction system that uses binary code to record and reproduce sound.
Infrasonic
Term applied to sound frequencies below 20 Hz, the normal lower limit of human hearing.
Frequency Modulation (FM)
Type of modulation in which the frequency of the carrier wave is varied above and below its normal frequency by an amount that is proportional to the amplitude of the impressed signal. In this case, the amplitude of the modulated carrier wave remains constant.
Echo
Reflection of sound.
Destructive Interference
Combination of waves so that crest parts of one wave overlap through parts of an other, resulting in a wave of decreased amplitude. See also interference.
Interference
Result of super posing different waves, often of the same wavelength. Constructive interference results from crest-to-crest reinnforcement, destructive interference of selected wavelengths of light produces colors known as interference colors. see also constructive interference, destructive interference, interference pattern and standing wave.
Amplitude Modulation (AM)
Type of modulation in which the amplitude of the carrier wave is varied above and below its normal value by an amount proportional to the amplitude of the impressed signal.
In Phase
Term applied to two or more waves whose crests (and troughs) arrive at a place at the same time, so that their effects reinforce each other.
Ultrasonic
Term applied to sound frequencies above 20,000 Hz, the normal upper limit of human hearing.
Mach Number
Ratio of the speed of an object to the speed of sound. for example, an aircraft traveling at the speed of sound is rated at Mach 1.0; traveling at twice the speed of sound, Mach 2.0.
Forced Vibration
Vibration of an object caused by the vibrations of a nearby object. The sounding board in a musical instrument amplifies the sound through forced vibration.
Acoustics
Study of the properties of sound, especially its transmission.
Reverberation
Persistence of a sound, as in an echo, due to multiple reflections.
Revolution
Motion of an object turning around an axis that lies outside the object.
Modulation
Impressing a signal wave system on a higher-frequency carrier wave; amplitude modulation (AM) for amplitude signals and frequency modulation (FM) for frequency signals.
FM
Abbreviation for frequency modulation.
Rarefaction
Region of reduced pressure in a longitudinal wave.
Pitch
Term that refers to our subjective impression about the "highness" or "lowness" of a tone, which is related to the frequency of the tone. A high-frequency vibrating source produces a sound of high pitch; a low-frequency vibrating source produces a sound of low pitch.
Beats
Sequence of alternating reinforcement and cancellation of two sets of superimposed waves differing in frequency, heard as a throbbing sound.
Carrier Wave
High-frequency radio wave modified by a lower-frequency wave.
Resonance
Phenomenon that occurs when the frequency of forced vibrations on an object matches the object's natural frequency, producing a dramatic increase in amplitude.
Compression
a) In Mechanics, the act of squeezing material and reducing its volume.
b) In Sound, the region of increased pressure in a longitudinal wave.
AM
Abbreviation for amplitude modulation.
Refraction
Bending of an oblique ray of light when it passes from one transparent medium to another. This is caused by a difference in the speed of light in the transparent media. in general, the change in directrion of a wave as it crosses the boundary between two media in which the wave travels at different speeds.