You can actually see sound waves as they travel through the air thanks to a clever photographic trick: Schlieren flow visualization
The title says it all: this blog features physics videos found everywhere on the web: animations, demonstrations, lectures, documentaries.
Tuesday, 15 April 2014
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Friday, 11 April 2014
Bill uses a replica of the point contact transistor built by Walter Brattain and John Bardeen at Bell Labs. On December 23, 1947 they used this device to amplify the output of a microphone and thus started the microelectronics revolution that changed the world. He describes in detail why a transistor works by highlighting the uniqueness of semiconductors in being able to transfer charge by positive and negative carriers.