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Longest string-can telephone. To make a string-can telephone (Fig, 17.29), punch a hole in the bottom of two empty food cans (or paper cups). Then, from the exterior of each can, run a string through the hole and tie a knot at the end to prevent the end from slipping back through the hole. Give one sad that someone with the instruction to walk away and then pull on that can so that the string is under tension. You can then talk to the other person by speaking into your ear. Your sound causes the can bottom to oscillate, which periodically pulls and releases the string, sending pulses along the string. When those pulses reach the bottom of the other can, that bottom oscillates, producing sound waves in the can's air. The other person thus hears your message. A better design is with steel wire (instead of ordinary string) that is welded to the can bottoms to form rigid connections. The Guinness World Record for the longest string-can telephone is , set in Chosei, Chiba, Japan, in 2019. Assume that steel wire was used. What is the time difference between a pulse sent along the wire and a pulse sent through the air?