A universal property of material objects is their ability to vibrate, whether the vibration results in an audible sound, as in the ringing of a bell, or is subtle and inaudible, as the motion in a quartz crystal. It can be a microscopic oscillation on an atomic scale, or as large as an earthquake. Oscillations in any part of an extended object or medium with undefined boundaries almost always propagate as waves.
KeywordsNormal Mode Excitation Function Round Trip Simple Harmonic Motion Airy Disk
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