Image credit: Andrew Davidhazy, Rochester Institute of Technology
This is a Schlieren image, which reveals differences in the density of air above the candles. To find out more about these images, visit Wikipedia: Shadowgraph, and to learn how to make one, visit Schlieren Photography Principles.
- Making one of these images is more complicated than making a shadowgraph, such as the image in From Physics Research.
- For more high-speed images by Andrew Davidhazy, visit this page.
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Once you have clicked on the "simulation" link below, be sure to read the Java Security Advisory before running the simulation: To do that, click the "Read now" button on the yellow band near the top of the PhET page.
Try the Physlet simulation from Davidson College to investigate the shockwaves and Doppler effect produced by objects moving at various speeds--in particular, at speeds below and above the speed of sound.