Reading...
Play button
Play button
Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
12 Cards in this Set
- Front
- Back
|
Infrasonic
|
describe a sound that has a frequency too low to be heard by the normal human ear; below 20 hertz
|
|
|
ultrasonic
|
describes a sound that has a frequency too high to be heard by the normal human ear; above 20 kiloherz
|
|
|
compression
|
condensed region of the medium through which a longitudinal wave travels
|
|
|
rarefaction
|
a rarefied region, or region of lessened pressure, of the medium through which a longitudinal wave travels
|
|
|
forced vibration
|
the setting up of vibrations in an object by a vibrating force
|
|
|
Natural frequency
|
A frequency at which an elastic object naturally tends to vibrate if it is distrubed and the disturbing force is removed.
|
|
|
Resonance
|
The response of a body when a forcing frequency matches its natural frequency.
|
|
|
Beats
|
A series of alternate reinforcements and cancellations produced by the itnerference of two waves of slightly different frequencies, heard as a throbbing effect in sound waves.
|
|
|
Carrier Wave
|
A wave , usually of radio frequency, whose characteristics are modified in the process of modulation
|
|
|
Modulation
|
the process of impression one wave system upon another of higher frequency
|
|
|
amplitude modulation (AM)
|
A 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
|
|
|
Frequency modulation (FM)
|
A 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.
|
