7) The diagram to the right
shows two sine waves, A and B,
which have slightly different
frequencies. A listener hears the
Sum of the two waves, shown at
the bottom.

Above diagram A, write “C” at each place where waves A and B are in phase, and creat constructive interference, and write “D” at each place where the waves are opposite, or out of ________ and create ________ interference. If these were sound waves, you would hear ________, as the combined waves had a higher and lower amplitude. “Waah, waah, waah, waah…”