Information Definition and 990 Threads

What kind of electromagnetic radiation can carry more information?. I mean, what is the relation between shorter or longer wavelength and the information that can go within. I wonder how the dynamics of this process works, considering that sound waves also can carry information, as well every...

Homework Statement A) Select uniquely decodable codes and instantaneous codes from Code1 to 5 of the image below: B) Personal question about second-order extension probabilites. If we have: probability of a symbol a P(a) = p1 probability of a symbol b P(b) = q1 Which is the...

I got an undergraduate degree in physics years ago, but recently I've been thinking I'd like to try applying to grad school in the next year or two. The subject I'm most interested in studying is quantum computing and more general quantum information science, with an emphasis on the theoretical...

Are there any limits for information transfer through sound or light? Or are these the limits of the devices that send and receive information through these two media. Request for clarification.

Homework Statement Two air track gliders of a mass 300 g and 200 g are moving towards each other in opposite directions with speeds of 50 cm/s and 100cm/s respectively. Take the direction of the more massive glider as positive. A.) determine the velocity of each glider after the collision...

Suppose you have a set of two particles and each of those particles is entangled with another particle in a corresponding set. You could cause wave function collapse of one of the particles to signify a 0 bit, or you could cause collapse of both particles to signify a 1 bit. The configuration on...

A lot has been written about the relative merits of decoherence versus the many-worlds theory in answering the question: where does the extra information go when a superposed state "collapses" to a definite state. However, what about the reverse: when the definite state returns to a new...

Hi, I have a question about the transfer of information at speeds faster than c. I have devised a thought experiment in order to express the logical problem I am having. Suppose you have a string of beads in a tube from here to alpha centauri where each bead in the tube touches the next...

Do you know guys that every satelites have some note that contains all about the Earth and human? It is to inform our information to aliens. And many people tried to infrom human's culture such as music and some great pictures and a lot of languages including English. And I thought...

I've been reading many articles on entangled particles lately and I have come across many pieces of conflicting data. The primary question I have is can any information be transferred between entangled particles, and if so, could we use entanglement as a method of sending information?

Hi PhysicsForums, I'm writing a term paper on the properties of the von Neumann Entropy, its relation to the Shannon Entropy, and the additional complications present in the von Neumann Entropy that are not present in the Shannon Entropy. Could someone direct me to articles and books that...

A friend of mine in the US highlighted a website - www.spokeo.com that is an online phone book but also has pictures that people have posted on their facebook pages, along with their age, education level, profession, credit score (available with membership), members of their household, home...

Pay with angular momentum instead of energy? What do the experts here think of this recent paper? http://arxiv.org/abs/1004.5330v1 In particular can you really change the spin or angular momentum without changing the energy? Would this also apply to ordinary momentum? (Note the authors say...

Is there such a concept in information theory? I.e. Something as complex as language can be reduced to 1's and 0's. Is binary the fundamental unit of information?

Hello, I have heard the following from several places: The amount of information that can be stored within a sphere is equal to the amount of information that can be stored on its surface. This seems like a contradiction or, a self-defeating statement. It seems to instead say that a...

Is there anyone who knows on how's the information being transferred from eyes to brain? I'm not asking about how a single optical nerve works here, but how does these nerves arranged so that they can convey a 'live video' from eyes to brain. Is it a matrix of optic nerves with a single nerve...

hi, I need information on optodecoders,optoisolators,optoencoders with diagram to explain. I had send this thread before but have't received a reply as yet. i hope my request will be entertained. thank you.

Does anyone know of any links to some good fiber optic information? I'm not looking for suppliers or sales pitches...rather something like www.Microwaves101.com , but for fiber optics... Other than arguments on comparisons, I haven't found too much in PF. Thanks.

Homework Statement suppose f(x) = x2 and let I = [0,2] i) if partition I is subdivided into n subintervals of equal length, write down the length of each subinterval,\Deltax ii) if ci , is the left endpoint of subinterval i, find ci . hence find f(ci)\Deltax Homework Equations N/A The...

I discovered this forum a couple of weeks ago and since then have come across some interesting subjects. I would like to expand my knowledge regarding these subjects. Does anybody know of an effective free online resource for self-education in mathematics?

I'm looking for a book written for non-scientists that has details about axions. As far as I know, they are particles that have been theorized and not experimentally detected. I'm not really sure why they have been theorized other than that they might be dark matter. Thanks for any help.

Hello is is a continuation of a discussion that got started in the special relativity section but is a split-off and more appropriate here. The question is does evolution add information to the genome?

hello,i had posted in this forum a question about linar algebra and quantum mechanics because i am studying quantum computation and information, i have the following book:"quantum computation and quantum information" by Michael A.Nielsen and Isaac L.Chuang. and i think it covers most topics of...

so today i was in a discussion with my physics teacher today about some of the various facets of general and special relativity. when the discussion came around to gravity my teacher said that if the sun were to suddenly disappear, although it would take the light 8 minutes to disappear, the...

Hello,I have a problem with electric circuits .Can someone explain method of potentials,method of contour currents,3 terminals:triangle and star . .Sorry for my bad language.I need information and i don't have equations attempt at a solution.!0x a lot

[FONT="Century Gothic"] PLEASE GUIDE ME... MY PROFILE IS >> BACHELORS IN ENGINEERING [INFORMATION TECHNOLOGY]--FROM INDIA >> 1.5 YRS OF INDUSTRY EXPERIENCE AS SOFTWARE PROGRAMMER [SMALL SIZE FIRM] >> M.B.A [MARKETING AS MAJOR SUBJECT AND HUMAN RESOURCES AS MINOR SUBJECT] --FROM INDIA...

Hi. I'm an undergrad majoring in maths/physics from a US university now taking a year abroad at university of Bristol (UOB) in UK. After this academic year, I'll go back to study in my home university for a year and then graduate. The quantum information (QI) researches at the department of...

Hi,all, my problem is: Consider a 2-D square well potential, say length 2L, and when I put one particle into this well, Does this particles IMMEDIATELY know what wavefunction it should have? I am trying to consider, once the particle enter the (middle of the)well, the information takes at...

Homework Statement List the ductility, yield strength and Young's Modulus of steel, rubber, nylon, concrete, alluminum, glass and rubber Homework Equations none The Attempt at a Solution I tried google and wikipedia with not much luck so I figured i would ask here. Any repository...

Homework Statement The range of a cannonball fired horizontally from a cliff is equal to the height of the cliff. What is the direction of the velocity vector of the projectile as it strikes the ground? (ignore air resistance) Homework Equations I attempted setting delta y = delta x...

I think I raised this before but I am curious to hear the reflections from all of you about one simple thing. The context of my question is the quest for a deeper theory of QG, along the lines of an intrinisic measurement theory, but the principal question can be easily phrased in terms of...

I'm a 25 year old undergrad, who has just returned to academia after a summer job as an iron worker - which is also the source of my screen name. Now at a community college, I've gotten myself into a "pre-engineering" program which would get me an AA and acceptance into any of Florida's...

I only recently 'discovered' this quantum computer business and quantum information. As I see it, this seems like a drastic departure from regular 'classical' computers. So if we ever get to the point of using these computers, won´t they have to rediscover the entire field of...

Homework Statement the first nuclear reaction induced in a laboratory can be represented by N147 + He42 = O178 + H11 what information can be obtained from the symbol O178 Homework Equations The Attempt at a Solution The number 17 represents the atomic mass, which is also known as...

Hello, I need to use sound to echolocate something. I need to find a way to describe the doppler frequency as a function of time, using a recording of the sound it makes while moving. Any ideas?

I am aware that a vector is a first-order tensor, and that a second-order tensor has nine components in three-space, but can someone tell me more about the directional quantities that are associated with these nine components? Are they still unit vectors? Can a second order tensor be written as...

How can I tell the difference between a free electron that's absorbed one photon at E = hf and a free electron that's absorbed two photons at E = .5hf? If a photon at frequency f represents a '0' and a photon at frequency .5f represents a '1', then I could send out '11', have an electron...

Homework Statement The coefficient of friction between a racecar’s wheels and the track is 1.0. The car starts from rest and accelerates at a constant rate for 400 m. Find the velocity at the end of the race. so Vo=0m/s x=400m mu=1 acceleration is constant and we need to find Vf...

information is a kind of "dimension" (like space and time) I always asked myself about how does information works in the cosmos. I read an article were some scientist told that information is a kind of "dimension" (like space and time), and its crucial for the conformation of systems (and...

The "No information Universe" It is widely believed that objective reality exists and the universe out there has existed for more than 13 billion years. My question to those holding similar beliefs is this: Had information existed before the first conscious observer(perceiving mind) came...

Note: This is a revised re-post of an earlier thread that I started, but I feel there was some misunderstanding in it's purpose so I have attempted to clarify with the current revisions. This is not intended to be a thread on metaphysical speculation, but rather an observation on a property of...

As many of you may be well aware, there is a rare condition known as "phantom limb." For those of you that don't, it's when a recent amputee still physically feels the sensation (usually in the form of discomfort or pain) of still having the limb. The perceived sensation is very often directly...

As many of you may be well aware, there is a rare condition known as "phantom limb." For those of you that don't, it's when a recent amputee still physically feels the sensation (usually in the form of discomfort or pain) of still having the limb. The perceived sensation is very often directly...

Is it possible to send information by laser? If so, how much faster is this than radio signal?

Hi, I was wondering first off, if it is possible to write code so that you could fill out fields in a web browser so that you could automate a process. I'd like to make a script that basically goes online submits my username and password and then fills out 8 hours worked in the appropriate...

i need some in information of adding (Manganes to steel )

I can't find any info on this type of A26.. can anyone help me out? Thanks in advance!

Homework Statement What is the lattice energy of LiI? Given the information below. Heat of formation for LiI = -270 kJ/mol Heat of sublimation for Li = 159.40 kJ/mol Ionization energy for Li = 520 kJ/mol Bond dissociation energy for I2 = 149 kJ/mol Electron affinity for I = -...

My question uses this definition of information: - An intangible and dimensionless thing that is not energy nor matter. - Can be an arrangement of matter (a typed/printed letter on a page) or a pattern of energy over time (music on the radio). I hear physicists talk about "information"...

Homework Statement The marketing department of a magazine collects the following information for a group of randomly selected subscribers. Of households that subscribe to at least one of their three magazines: 25 subscribe to teen world only 19 to star watch only 15 to fashionz only 41...