of waves of unequal frequencies (formation of Beats)
When the waveforms are running,
a red crossed point will appear in the interference pattern. This is the observation
point, at where the two individual waveforms and the resultant waveform are
displayed on the right hand side of the applet.
observation point is draggable to move.
waveform of "wave I" is draggable to move up and down.
The grey lines of the interference pattern are the nodal
lines, at where destructive interferences take place.