Children sometimes play with a homemade telephone by attaching a string to the bottoms of two paper

Question:

Children sometimes play with a homemade €œtelephone€ by attaching a string to the bottoms of two paper cups. When the string is stretched and a child speaks into one cup, the sound can be heard at the other cup (Fig. 12-29). Explain clearly how the sound wave travels from one cup to the other.

Children sometimes play with a homemade “telephone” by attaching