Schrödinger's cat

It was a thought experiment which describes a paradox of quantum mechanics with an cat as representor of the macroscopic world. This experiment was described by Erwin Schrödinger in 1935.

The main question in this experiment was, is the cat alive or dead? The scenario presents a situation where the cat could probably be both simultaneously, dead or alive. This state is known as quantum superposition.

The experiment contains of an box, a cat, a flask of poison, a radioactive source in an sealed container, and an Geiger counter. If the Geiger counter detects radioactivity, the flask will be destroyed and the cat will be killed. Nobody knows when the radioactive source will collapse and as long as nobody looks into the box, the cat is both dead or alive. 

Schrödinger’s famous experiment poses the question, when a quantum system stops existing as a superposition of state and become one or the other.

Hafele – Keating – Experiment

At the beginning of the 20^th century Albert Einstein created the theory of relativity.
One of his theory said, that gravity expands space and time. 
As a result, two very accurate watches should measure a difference, if one watch is closer to a gravity source than the other one.

In the experiment two atomic watches were used to approve Einstein´s theory. Originally the two atomic watches were used, which worked very similar. During the experiment, one watch was placed on the ground an the other one was carried on a plane. 
After the experiment the two watches had difference of 39ns. So, the first approve of Einstein´s theory was realised.

Welcome!

Hi Everybody!

This is the blog where you can upload your descriptions of famous experiments...