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Jun28-03, 10:59 AM
P: 3,715
Fliption, some of the information in that site that you quoted is rather misleading. You see, the observation of particle's state does require intervention, but what they fail to bring up (at least in the first site, I haven't been able to look at the other two) is that that is the whole point. The energy that must be exchanged, in order to make a measurement, alters the state of the particle. However, one needn't be trying to measure the particle, in order to change it, as we are always interacting with these particles - just not as strongly (concentrated) as when we are trying to observe them.

Say you try to observe a single electron. In order to do this, you must concentrate a beam of "light" (photons) on it. But the smaller something is, the more energy (photons) you must use to see it, and thus the greater a bombardment you are making on the electron. Conclusion: The harder you try to see it, the more energy you concentrate on it, and thus the more you change it.