From Wikipedia:
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//A cat is placed in a room that is separated from the outside world.
A Geiger counter which counts the amount of radioactive decay and a little bit of a radioactiveelement are in the room.
Within one hour, one of the atoms of the radioactivematerial might decay (or break down because the material is not stable), or it may not.
If the material breaks down, it will release an atomic particle, which will hit the geiger counter, which will release poison gas, which will kill the cat.
The question now is: at the end of the hour, is the cat alive or dead? Schrödinger says that according to the Copenhagen Interpretation, as long as the door is closed, the cat is dead and alive. There is no way to know until the door is opened. But by opening the door, the person is interfering with the experiment. The person and the experiment have to be described with reference to each other.
By looking at the experiment the person has influenced the experiment.//
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