Hi, I'm just wondering what the physics are behind why a tin can phone works (two cans connected by a string, one speaks into one can, and the other can hear it in the can on the other end.) Is it simply that when one person talks into his/her cup, the bottom of the cup vibrates back and forth with the sound waves and the vibrations travel through the string by pulling the string back and forth, therefore, the bottom of the second cup should start to vibrate back and forth just like the bottom of the first cup is vibrating, producing sound waves. The second person can hear the sound waves and can therefore hear what the first person says. But is it really that simple? And how exactly to the vibrations of the string transport the actual sound waves themselves along the way?