# Can someone help with this quantum question

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what are some similarities and differences between measuring an object in the quantum world and measuring an object in the macroscopic world? Any input is appreciated

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In the quantum world there is a fundamental limit to precision from the Heisenberg uncertainty principle.

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• 4 weeks later...
Any input is appreciated

All the previously deleted posts from this thread have been moved to their own thread right here. They had too much speculative science to be deemed appropriate answers to mamibrkly's original question.

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The uncertainty principle. You can know the momentum of a particle or its position, but not both. Check about the Copenhaguen interpretation of quantum mechanichs!!

or better check this:

http://www.tubepolis.com/play.php?q=copenhaguen%20interpretation&title=Free%2BWill%3F%2BQuantum%2BMechanics%2BClarified%2B%28Part%2B1%29&id=o_2JeUegZd8&img=http%253A%252F%252Fi.ytimg.com%252Fvi%252Fo_2JeUegZd8%252Fdefault.jpg

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what are some similarities and differences between measuring an object in the quantum world and measuring an object in the macroscopic world? Any input is appreciated
Objects in the quantum world are "actions". This is why we have Planck's constant. When we talk about a photon, we express energy as hf and momentum as hf/c. The h is Planck’s constant of action, being 6.63 x 10-34 Joule-seconds. Action is energy multiplied by time, and also momentum multiplied by distance. The f is of course frequency per second, and the speed of light c is distance divided by time, which converts a measure of energy into a measure of momentum.

What's important is that the photon isn't some "billiard-ball" particle. It isn't an object. It's an action. It's akin to a kick. OK now, try measuring a kick. You know it isn't an object, you don't expect it to have a shape or a surface. Because it's an action. And an action is only an action if there's some motion involved, so you can never pin down the location of a kick. You can only say where you detected it. Ouch! Another action is a shout. There's no specific place where it can be located at some point in time. It's a spherical compression wave in air expanding outwards, and whilst it has a centre, you can't go and stand next to my mouth and say "this is where the shout is". Instead, when you hear it, you say "the shout is here". And then somebody else hears it and says "the shout is here", and it's like it's in two places at once.

That's what the quantum world is like. Once you understand that you aren't dealing with objects, it isn't mysterious at all.

Edit: I should add that everything is like this. Not just the "objects", but the things you detect them with too. That's why things are uncertain.

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