Description:  In the clip below, two identical plastic balls are dipped in the water simultaneously.  The resulting waves move across the water and move through or interfere with each other. The clip was produced at 15 frames per seconds

Larger Video Frame
 

Questions.

1.  Find the place where the two waves first meet. Does it appear different (i.e. darker/brighter)?

2.  Why do you think this point appears different?  You may want to consult with the glossary.

3. As the clip continues what changes happen to this overlap spot?

On to Part Two