Information Definition and 999 Threads

I hope this isn't a common question, and that I'm not breaking any rules of posting - please let me know if I am, as I'm new here. So, to describe what I'm trying to ask: Picture a very long rod, say, one light-year long. Imagine it's in space, and is free of gravitational interactions (and...

Does the light ray that had hitted a body carry the information about the body that it has hitted? Because when we see our own image in a mirror the image is same as of us. so do the photons of light carry information about the part from which they are reflected? thanx

Homework Statement For each of the four cases below, sketch a graph of a function that satisfies the stated conditions. In each case, the domain of the function should be all real numbers. (professor also mentioned he wants us to write it out in piecemeal function format) a) lim(x→2) of...

Sorry. The title should read finding volume with little information. Humongous typo :) Homework Statement Suppose you are given 0.50 liter of 0.500 M acetic acid, and 0.50 liter of 0.250 liter sodium acetate. What is the maximum volume of buffer solution that you can make if the buffer must...

I really can't understand the uncertainty principle,and now there are some experiment that violate the uncertianty principle, I need deepen understanding of quantum uncertainty,who can give me all the information about the uncertainty principle,such as new ideas,related study or books,thanks

I am trying to find a consistent, non-circular definition of information, which includes quantum information. The two main definitions that recur are the von Neumann entropy and the superposition definition. Let's take the latter; the former is similar. This would mean that any change in the...

I don't know if this has been asked but if you imagine a pipe that theoretically extends from one end the universe to another two people at each end, and by twisting the pipe left means "yes" and right means "no" if you twist it what happens

I'm having trouble with the idea of conservation of information. I watched Susskind introduce the concept of entropy as "hidden information", using an example of drops of water filling a bathtub: a message encoded in the sequence of drops is lost for practical purposes, but in principle is...

Where can I get more information on the theory of tides? http://en.wikipedia.org/wiki/Theory_of_tides I would like to see more of the derivation and explanation of the tidal forcing section in the link above. I have read the section Taylor's Classical Mechanics on Tidal Force as well...

Any consciousness based approach to QM will be dismissed as woo in the main forum. However it's admitted that (with refernece to the double slit experiment): "To be clear, the rule for interference in these cases: if it is possible, in principle, to know which slit the particle goes...

I'm not all that learned in Quantum Physics, but I read about this, and it piqued my interest. I read that the minimum speed that's been found for Quantum Entanglement, according to research done by Prof. Juan Yin and colleagues at the USTC in Shanghai, is 10 000c. This doesn't rule out the...

I'm skeptical of something Neil Turok said, having to do with quantum information. http://thetyee.ca/Books/2012/10/13/Neil-Turok-Universe-Within/ From what I understand, a qubit can store an infinite amount of information. So, where does he get the number 300 from? Why not just one? Also...

I have found sites like coursera.org, and I have also heard that M.I.T. offers free online courses as well (though I have yet to have browsed their site for them). I am wondering how these courses work? I see that you get certificates of completion, but do they have any actual meaning? Is it...

Homework Statement Let Q(t)=t2. Find a formula for the average rate of change (ROC) of Q over the interval [1, t] and use it to estimate the instantaneous ROC at t = 1.Homework Equations For x1 ≠ x0, the average rate of change of y with respect to x over [x0, x1] is the ratio Average ROC =...

In the paper "A Mathematical theory of Communication" by Shannon I couldn't understand a theorem (Theorem 4) under the topic "The Entropy of Information Source"- Here 'H' is the entropy. Can you explain me how we get this theorem? What is this n(q)? I couldn't understand the sentence...

Hello everyone, I am looking for some resources that could help me understand interesting properties of S^3 (or S^n really). I am doing a small project for my topology course and in my studies I have found that I lack knowledge about S^3. Are there any good texts or online lecture notes...

Hi, I haven't been following the search for the higgs boson and what it could actually mean to our understanding of the physical universe. The only fleeting thought I had was that if it gives mass to matter, it can lead to an understanding of gravity on an intrinsic level. Instead of...

Homework Statement We have a carousel that completes a revolution in 4,0 s. The radius of the carousel disk is 0,8 m and the length of the (massless) rope is 1m. A horsey or whatever weighing 1 kg is hanging from the rope. Can we from this information extract the velocity of the horsey...

I watched this documentary about an argument involving information loss in a black hole, Stephen Hawking managed to wind everybody up by claiming information was lost and therefore broke existing laws of physics. Its an old recording so it may not be relevant anymore but one part of this...

Hi everyone, I'm looking to go to graduate school for a Master's in scientific computing or computational science but want to go back for a PhD in physics. I'm just starting to look into quantum information theory and while I find plenty of PDF files and articles about the topic I can't find...

I am currently studying in 12th standard in India. My subjects are English, Bengali, Maths, Physics, Chemistry and Computer Science. I am quite good in mathematics. I would like to study maths and physics in Germany. Please give me some detailed information about the maths ans physics curricula...

How can we know anything about black holes if nothing, not even information can escape the event horizon? If we can know the mass and gravity of a black hole it is because some information is being sent by the black hole, but how can this be possible if nothing, not even light, can escape...

It seems to me, and correct me if I am wrong, that someone with a masters in physics has just as much concrete knowledge of physics as someone who has a PhD (generally). After you get a masters you have pretty much taken all the courses one could take right? The next step is to APPLY the...

Hi, In general maintaining eye contact talking with people creates a sense of connection, but how do you feel about maintaining eye contact when listening to complex instructions? I often find it hard to maintain eye contact if an instructor is telling me something complex (such as...

I heard Claude Shannon believed all information could be expressed as a string of bits. Is there a theorem supporting this claim, or is this just some kind of folklore belief?

I'm trying to read more into the Lagrange-Gibbs F and G solutions for orbit determinations, but I just can't seem to find anything on it. It's in the lecture slides and in the textbook, but when I do a simple google search, I am not getting anything. The theory is correct and all, so I'm pretty...

I came to know about this "Research Science Institute" which is a summer research program for rising high school seniors around the world . They say about 30 students from around the world are selected for this program that is hosted at MIT. Can anyone tell me about the selection procedure...

Hi, i have a question, what's about Einstein 'information keeping' law in matter and antimatter annihilation process, is any information left after this process ?

Hi! I am not much of astrophysicist or something but read something about Black hole information paradox in a book. Could anybody please explain me what is the meaning of term and why does it happen? P.S. Please include Hawking's radiation as well Thank you in advance

Have any-one used the Book titled Graduate Programs in Physics Astronomy and Related Fields updated every year by American Institute of Physics. Please share your experience with this book.

Okay So I hear there is this thing out there called Information, have you heard about it? I wouldn't doubt that you have, I mean you, the surroundings, the landscapes all need inform... erm, are Information in some form or another, yet it doesn't have definite shape, somewhat like energy. I am...

I hear that there is thing out there with communication with in all types of systems and it is called Information Technology (IT for short) Can some one expand upon this field of engineering, I would like to know a little bit more, And as always, Please and Thank you!

If the information we see in space is very old, and the universe "seems" to be expanding, how can we know that it is still expanding?

Hi this is my first post so i hope its ok :). I was wondering what are others opinions on this ? ? THIS IS THE LINK LOOK AT THIS WONDERFUL LINK Have you ever wanted to be a human usb ? ? Personally i don't see where this could go if they were able to start storing large...

Hello all. I was wondering if anyone know of a website where I can learn more about magnetism? Nothing in particular, I just wanted to know as much as I can on the topic. I have a huge interest in this topic and hate spending so much time looking online only to find bits and pieces. Please...

A harmonic wave traveling in +x-direction has, at t = 0, a displacement of 13 units at x = 0 and a displacement of -7.5 units at x = 3λ/4. Write the equation for the wave at t = 0. Homework Equations The equation for a harmonic wave is r = asin(kx-vt+θ) a being the amplitude k...

In (Shannon) information theory, information is said to be the log of the inverse of the probability - what is the information content of 1+1=2? Or for that matter any fundamental axiom.

an ideal electric fan has: a constant supply of 0.49 HP (367.8 watt), 3 motor poles, 8 blades, radius of 36 cm. based on all of that info. how can i find the torque/RPM or both? if you know the answer tell me it with the method to find the torque/RPM. p.s. i just threw in all of the...

Here's the deal. Last year, my self esteem was down the drain. It still is, somewhat, but I'm in a much better place than I was last year, and it's getting progressively better. I started an application to a very small (less than 300 students) liberal arts college (not in the US; but it's...

There seems to be a not very solid description of the concept of conservation of information on the Internet. Leonard suskind described the idea very well on discos program on the hawking paradox but this is the only place I have seen it described well. Any thoughts why cons of information isn't...

I am new to this forum, and posting in forums in general, so this is a slightly strange experience for me. I would like to kindly and respectfully request everyone's cooperation, and if those posting would be respectful in their answers. I was recently reading through an article on an...

I am currently a sophomore attending Indiana University of Pennsylvania (IUP) and majoring in physics. I am very studious and have maintained a 4.0 for the three semesters I have completed so far. I am hoping to graduate with a 4.0, which will be difficult but I think it is achievable. I am...

I was having a discussion with an individual who was claiming that information is a form of energy. I disagreed with that claim. Over the course of the conversation, he provided me with the following article http://physicsworld.com/cws/article/news/2010/nov/19/information-converted-to-energy...

Electronics using heat rather than charge for carrying information!? http://www.scientificamerican.com/article.cfm?id=magnetism-confirmed-to-control-the-flow-of-heat So the article states it's been confirmed that magnetism controls heat. It also mentions that future electronics could use...

Homework Statement I've been going over past papers recently and I can't see how to start this one, I get confused with the reference frames and it looks like I don't have enough information to start this. "An unspecified meson has a mean lifetime , defined in its rest frame, of t =...

I was trying to understand wave function collapse in terms of superposition, but I ran into some problems when relating back to information theory/entropy. It is given in the definition of information in terms of entropy energy is needed to transfer information. That is something we have always...

Of course i don't mean EVERYTHING, but as far as school goes. It seems to me that getting a bachelors in physics gives you most the information, and then grad school is just finding new discoveries based of information you learned getting your bachelors. Is that somewhat right?

The black hole information paradox is resolved by considering that "...information is not lost in a black hole, but that all of the information of what is inside of a black hole can be viewed on the event horizon". As the black hole gets smaller and smaller through the emission of Hawking...

Hello, Here http://www.mathpages.com/home/kmath210/kmath210.htm it is written that "...in order to actually convey information, a signal cannot be a simple periodic wave...". I've met this statement in several other places too, this one is just for reference. What does that mean that a simple...

Hi All, I have an unknown 16S ribosomal RNA gene sequence below that I am trying to identify. I know its a bacteria but anyone know of a site/program online that allows you to enter the sequence below and it gives the likely close match? TAGGGAATCTTCCGCAATGGACGAAAGTCTGACGGA...