Hello friends of steemit, the intention of this post is not to give a physics class, what I want is to give a small explanation Doppler effect, with the sole intention that all those people can see the physics behind this Doppler effect.
The best way to begin this explanation is by giving an example, which I use to explain to my brother about this subject. We were visiting an aunt's house, my brother and I, when we are at the front of my aunt's house, a vehicle passes, with the sound equipment at full volume and I ask my brother why we no longer listen music. And he responds to me, because that vehicle is already gone, and I tell him very well and what physical explanation you imagine of what has happened, and was not sure.
Explain the Doppler Effect: it is the apparent frequency change of a wave produced by the relative movement of the source with respect to its observer (1). The best example to understand this definition is what has just happened to us. My brother was excited that day because he learned something new. Thanks for taking the time to read this post and this wonderful steemit platform.
An animation that illustrates how the Doppler effect causes the car engine or a siren to produce a sharper sound when it is approaching than when it is moving away. The pink circles represent the sound waves. Image source: [1]
Here I leave an explanatory video on the Doppler Effect, so that they can understand this subject much better.