"The Big Bang Theory" and the Doppler Effect.

Yesterday I discovered a chapter of "The Big Bang Theory" absolutely awesome. Real Fun!

In this episode,  Sheldom Cooper is disguised as a "Doppler Effect", a very well-known effect in Physics.  It has to do with some original features of waves, such as sound or light: it is the change in frequency of a wave for an observer moving relative to its source.

I will try to give you a simple example: 

Think about a train coming in our direction: the sound we hear  is more piercing than usual (we say the wavelength is getting shorter). But once the train passes us and starts moving away, the sound we hear gets  deeper (and then we say the wavelength is getting longer).  This simple experience is what we physicists label  as a "Doppler Effect". And it is surprisingly useful, since for example you can prove the expansion of the Universe with it...

If you haven´t heard about it before this post, perhaps now you  can enjoy this:

In English

En español

That is all, just have fun!