Description:  Two sources make waves in the water at a steady rate, creating a pattern of overlapping regions. The clip was produced at 15 frames per second.

Larger Video Frame

Questions:

1.  Lines have been superimposed on this clip, what do they represent?

2.  Destructive interference occurs when crests and troughs overlap.  In the last frame of the video, how many separate occurences of destructive intereference can you detect?

3.  Compare the pattern of destructive interference to the superimposed lines.

4.  What name should be given to the destructive interference patterns?

On to Part Three