In the above video we study
reflections
of a wave in a cord with both ends fixed.
The video halts every time just before a new reflection
of the wave enters the cord.
1st pause:
Just before the first
reflection from the righthand side enters.
Notice here that the cord contains 4 complete cycles
(4λ) of the incoming wave.
When the reflected wave moves to the left you may observe
standing waves occur because of its interference with the incoming wave.
The maximum amplitudes of the oscillatory movements are twice
the amplitude of the incoming wave.
After each subsequent pause the maximum amplitudes
of the oscillatory movements are a corresponding amount larger than
the amplitude of the incoming wave,
as one would expect.
The maximum amplitudes of the oscillatory movements
would become infinite if the video would continue forever.
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