We know that measuring the speed of light with an Arduino is possible. It’s just that the implementation is hard. [Udo] hit upon the idea of pulsing a laser pointer and measuring the time of the ...

Professor Brian Cox explains how light travels so fast that people believed it was instantaneous. A Danish astronomer, Ole Rømer, noticed that Jupiter’s moon, Io sometimes seemed to appear ...

It can be used to analyze particles with sizes ranging from a few nanometers to several microns. This image depicts the principle of Dynamic Light Scattering (DLS) for measuring particle sizes. At the ...

And so we measure distances in 'light years', which is very simply the distance that light travels in one year. Now, light travels very fast - 300,000 kilometres per second - so, to get the number ...