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Light: Wave-particle duality

Light: Wave-particle duality Creative commons image By Douglas Hofstadter [CC-BY-SA-3.0], via Wikimedia Commons under Creative-Commons license
Introductory level Duration 10 mins Updated 11 Sep 2013
One of the most confusing concepts in physics, wave-particle duality is unlike anything we see in the ordinary world.

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Telescopes and spectrographs

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Telescopes and spectrographs Copyrighted image Copyright: Used with permission
Intermediate level Duration 10 hours Updated 02 Mar 2016
This free course, Telescopes and spectrographs, looks at how they are designed to improve our ability to observe the universe. You will examine how...