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I got the idea for this experiment while working on the rocks we collected recently. When we got home last weekend, we unloaded the 750 pounds of quartz crystals from our Arkansas trip onto the back patio. Then I left for Philadelphia to present some electricity shows. Today, I went out to unpack some of the boxes. We had wrapped the best crystals in newspaper, and all the newspaper that was exposed to sunlight had turned yellow. Cool! A chemical color change that happens fairly quickly, and is caused by exposure to light!
I really wanted to use the Electric Tape experiment for a video, but the sparks did not show up enough on tape. Until I can afford one of the new, super low light video cameras, we will have to get by with reading the text version. After the recent news articles about producing x-rays with adhesive tape, I thought it would be fun to do an experiment that would help explain how it works.
I hope that you made your own Whistle Stick, and have been playing...., I mean experimenting with it. I also hope that you spent some time thinking about the science behind the sound that it makes, because that is what we are going to explore this time. For your exploration, you will need:
Today I was playing with sound experiments, and had so much fun with this one that I thought I would share it. It is based on the original phonographs, which used a very similar setup to play recordings of music or voices. They used a large cone to increase the volume of the sound.
I was talking with a group of educators about demonstrations. The conversation led to an interesting discussion, and this experiment. It is one that we did back when I was a kid, and it is still fun.
Tonight I was remembering a summer when I was part of an expedition to dig dinosaur bones in South Dakota. We set out tents up on top of the bluff, where we would have a nice view of the area and because it was very close to the bone quarry. While we were at the quarry digging, the wind came up and our tents were blown quite a ways down the hill. It only took us three trys to give up and move our camp down into a ravine. At least we found lots of dinosaur bones.
