Kindergarten scientists continued their investigation of sound. I demonstrated how a thunder tube works. Click here for an explanation. Then I explained that talking cups work in a similar way. I wet the string hanging from the cup, and slid my wet fingers down the length of the string. The sound traveled up the string and was amplified inside the cup, like a speaker. Click here for more information about this investigation. Then we tested how the sound changed with cups of different sizes and materials. What would happen if we tried different kinds of string?

Next, we swung sound tubes. The faster we turned the tube, the higher the pitch. Click here to learn more.