The first of two apps on Phase Difference allows for interaction to demonstrate the oscillation of two different particles along the same wave with a variable phase difference.
The second shows two waves also with a phase difference.
In both cases, the phase difference
where
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This is crazy this is revolutionary thanks for opening my lens
You have brought upon quite a fantastic revelation and widened my lenses for a completely new world. Thank you so much, Mister Physics Lenser!