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Thanks!

As you may have noticed, I am not the good at English so I will try to explain with pictures. Before & after: http://www.physicsclassroom.com/class/waves/u10l3c5.gif During: http://www.physicsclassroom.com/class/waves/u10l3c3.gif When these waves interfere, the particles don't move. Then...

Hi! When two equal waves meet in a destructive interference a short while the resultant wave is flat. What makes the waves reappear?