Murielle Dunand

"Green Whirlpool"

This photo illustrates both circular motion and reflection. However, at first glance, it can be very hard to see what this is a photo of.

This picture was created in a very dark room by placing a square piece of tin foil on a rotating disk. Then, I shone a green light on the spinning foil to give it its color. The lights were off so that the green would be the brightest light in the picture to keep from it washing out. The rotating disk and green light was achieved by creating my own circuit using the littleBits Premium kit. The foil was rotating on its axis (using the circuit) very quickly, and this is a strong example of circular motion. The piece of foil was originally square, but it was spinning on its center so rapidly that the edges blurred and it appeared circular. The corners were moving so quickly that the corners seemed to be on all sides of the foil, again making the circle. Also, the small wrinkles in the foil blurred and spread in the same circular motion, making the foil seem as if it had concentric circles in it. The light reflects very well off the foil because it is made out of aluminum. In metals, the free electrons oscillate from the light wave, and the reflected ray retains its color.

The picture was taken relatively close up so that the only thing in the picture was the foil.

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