ABSTRACT
In this test the terms have the following meanings: Amplitude is the maximum value of the displacement of any particle, measured
from its equilibrium position. It can have a negative value. Antinode is the point which has the maximum disturbance of a mode of vibration.
Antinodes are half a wavelength apart. Coherence is the phenomenon observed when the particles vibrate independently,
start and stop in order and pass through zero at the same time. Coherence is the phenomenon observed when a constant phase difference exists. Two frequency components which have the same amplitude ratio and phase difference in all frames have a coherence 1. A zero coherence indicates no correlation at that frequency.
