Use the drop-down menus to explain how noise cancellation works.
Waves with similar
are created to interfere with unwanted sound waves. The
wave overlap with the troughs of the other wave, causing the two waves to cancel out each other.
of one

Aheavy boy and a lightweight girl are balanced on a massless seesaw. the boy moves backward, increasing his distance from the pivot point. what happens to the seesaw? it is impossible to predict without knowing additional information. the side the boy is sitting on will tilt downward. the side the girl is sitting on will tilt downward. nothing; the seesaw will remain balanced.