6 ms·
I always use this fact as a kind of analogue to explain position-momentum uncertainty in physics. From a blurry photo of an object, you can easily measure the s
by Retra 12y ago
I always use this fact as a kind of analogue to explain position-momentum uncertainty in physics. From a blurry photo of an object, you can easily measure the speed, but the position is uncertain due to the blur. From a very crisp photo, you can tell exactly where it is, but you can't tell how fast it is moving because it is a still photo.
It's a good way to start building an intuition about state dependencies.
- shiven 12y agoWelcome to Heisenberg's uncertainty principle[0] in the macroscopic world! [0] http://en.m.wikipedia.org/wiki/Uncertainty_principle http://en.m.wikipedia.org/wiki/Uncertainty_principle
- unknownian 12y agoWould it not be the observer effect instead?
- carlob 12y agoAnother way of say of saying this is that a drum beat has no definite pitch because it's too short. It's exactly the same property of Fourier transforms behind the uncertainty principle.
- Retra 12y agoThere's also a broader picture -- that this effect arises because we use discrete, independent words to describe inter-dependent phenomena. The concepts of momentum and position are not good 'factorizations' of reality, so trying to talk about it in those terms leads to structural problems when you increase precision. It's the same kind of problem you get when you try to talk about objective/subject morality, or whether science can prove things. Another example I give: The Sun revolves around the Earth -- True from Earth's perspective. The Earth revolves around the Sun -- True from Sun's perspective. They both revolve around their center of mass -- True in Newtonian model. The both follow straight geodesics in spacetime -- True in Einsteinian model. Everything is true in some approximation. The idea is to increase your precision so that you can find truths that incorporate more information and thus provide greater insight and generality. If your language doesn't have enough 'bandwidth' to carry the information of -- that is, mimic the structure of -- your experiences, you have to develop more structured abstractions, or you'll lose clarity and expressive power. So, for instance, you wouldn't have to prove that unicorns don't exist: you just have to show that providing more specific information doesn't result in a lack of clarity in a general model. A theory of three-legged unicorns offers no advantages over a model of n-legged unicorns because unicorns don't exist. But now I've gone off the deep end...
- darkmighty 12y agoI don't position or momentum are bad descriptions of a system. Also, it's not "factorizing" the system into the two parts, since they are related by a transformation (i.e. they are interchangeable, doesn't happen in factorization). It's important to have a good knowledge on the subject before you try to interpret meaning of it and specially when you try to extrapolate the situation. I'm saying this also because the initial analogy wasn't so strong to begin with. A bunch of incorrect analogies can build the wrong picture of a theory which is hard to get rid of people's minds. Which is why it's good to reason through principles and not analogies (analogies are useful for other purposes: building bridges between the understanding of two different fields. I believe -- and they're made precise and clear in their shortcomings).
- Retra 12y ago
- danieltillett 12y agoIf you know the direction of the motion of a blurry object isn’t the location of the object on one of the leading edges? I thought the problem was more that you have no idea of the features of the object?
- darkmighty 12y agoIndeed, motion blurring preserves almost all* information of a picture, given some assumptions (e.g. brightness stays constant, path is predictable). *A linear blur of a 2D picture acts like a 1D sinc filter: information is completely lost only at spatial frequencies multiples of 1/d in the direction of motion, where d is the linear displacement, and otherwise attenuated.