The students are to compare how the sound waves are stronger when the string is pulled tight between them as they talk. Later, the students can experiment further by adding more people to their partnership of cups. The sound waves are strong enough through the tightly pulled string for at least 8 people to hear someone talk through the cup. Student A and B will stand opposite of each other as they each hold plastic cups that are connected to one another. Student B and Student A will then switch roles.
Students can experiment using different voice levels and different string tightness.
Try overlapping cup string with another set of partners. Make observations about the differences in the sound waves.