This site from the Exploratorium provides an activity to detect the flickering of a LED or neon glow tube. These light sources turn on and off too frequently to be observed normally, but when an observer makes a raspberry (gives a Bronx cheer), the observer sees a flickering light. The site contains an explanation for the effect and suggestions for other activities that demonstrate the same results. This activity is part of Exploratorium's Science Snacks series.
%0 Electronic Source %D August 2, 2006 %T Bronx Cheer Bulb %I Exploratorium %V 2014 %N 7 March 2014 %8 August 2, 2006 %9 text/html %U http://www.exploratorium.edu/snacks/bronx_cheer_bulb/
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