Wednesday, October 10, 2012

Why is the sky blue during the day and dark at night?

Two nice physics videos that explain a part of the question above.

Walter Levin does two magnificient demonstrations: in the first he shows why the period of a pendulum is independent of amplitude and mass (this part is cool!). In the second demonstration, he explains beautifully how Rayleigh and Mie scattering conspire to make the sky blue, clouds white, and sunsets red.

The MinutePhysics channel on YouTube also has a lot of snappy videos. Here is one that tries to explain why the sky is dark at night.

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