Choice Definition and 667 Threads

Hello! I am new to this site as you can see but I plan on being here for a while. I am just finishing my freshman year of college, and I have 20 unites with between a 3.4-3.7 GPA. This year I did not want to declare a major because I was to scared to commit to one.. Ive known my whole life I...

I'm a 1st year college student who is strongly considering EE as my major. I am very interested in energy sources (nuclear fusion), quantum computing, and pretty much anything that might show up on science fiction movies/novels. At the moment, I am thinking about majoring in EE as an undergrad...

Delayed choice quantum eraser – Yoon Vs Walborn experiment/paper is it true that in the Walborn experiment we manipulate p, but in Yoon paper we do not? The below link discusses the Walborn paper: http://grad.physics.sunysb.edu/~amarch/...

I still don't get it, "changing your choice." 21 is on, you know the old situation where you're given three choices, you make your choice, then one of the incorrect options is eliminated, and the question is whether or not it benefits you to change your choice. The answer is yes, apparently...

Hi, I have three M.C. questions. The answers to these questions are A, D, C. I am not exactly sure why exactly those are the correct answer (I guessed for the first one and happened to be right). Homework Statement http://ploader.net/files/1ddefae5044a52afb36b512bc019aaf5.PNG Source: IB...

Hi, I'm trying to make a decision! I've gotten accepted into UCLA and UC Santa Cruz for astrophysics undergrad. I absolutely love Santa Cruz, and I've heard that there is more opportunity for undergrad research there, as well as smaller class sizes. However I also know that UCLA has a famous...

So if we have a finite collection of disjoint non-empty sets, one can show using ZF only(with no need of AC) there is a choice function. I understand the reason for this. My confusion is when one goes to non-finite collection of sets. For example if the index set is the Natural numbers, why do...

Homework Statement http://physics.ku.edu.kw/LectureNotes/TheoryCourses/PHYS102/ExamPapers/y0910-2-md2.pdf page 6 number 5 Homework Equations The Attempt at a Solution I don't understand how they got the answers ? i applied the loop and junction rule but they only give me more...

The behavior of the particle at the slits seemingly depends on what the photon encounters after the particle has passed through the slit(s). Does this prove that: 1. Particles can go back in time and do stuff? 2. Has quantum erasers been done using electrons or molecules like buckyball...

Can someone pretty please explain to me the axiom of choice as unrigorously and casually as possible ;P. And then you could include a rigorous explanation if you wish, but I mean I could just go to wikipedia for that..which I already did... in fact I think I'll include the wiki explanation and...

Hi, for spring break homework I had to take this "calculus readiness test" thingy and I got a score of 19/24 and I'm trying to go through the test and see which ones I got wrong. I'm however perplexed because I don't see which ones I got wrong. I guess I got five wrong but don't see which...

I'm going to be going to college in about two and a half years, and I've spent some amounts of time trying to figure out what I should major in. So far, I've come up with this: Double major in Electrical and Computer Engineering, minor in physics. I just have some questions for this, however...

Homework Statement the capital letter option was the answer that i have chosen in my test. Homework Equations The Attempt at a Solution 1. The areas under the hysteresis loop is proportional to a) Magnetic energy density b) Thermal energy per unit volume C) ELECTRIC...

Homework Statement Somebody please check my multiple choice questions, I have attempted in my exam. The capital letter is the answer that I have ticked in the exam. Homework Equations The Attempt at a Solution 1. The angular momentum of a particle under the influence of a...

Please teach me this: For gauge symmetry fields,only one of any elementary subconfiguration of the whole configuration covers the all physics of the field.So we need to cut off the redundant configuration.It seem to me,in a loose sense,there is only one way to cut off the redundancy(the gauge...

I'm studying for a test tomorrow, I found these multiple choice questions but no answers to them. If you can help me out so I know which one is correct so I can study properly, that would be much appreciated :D 1. A 24-kg traffic light is suspended from the midpoint of a cable suspended...

Topic can be Closed! EDITED: Got answers from a friend!

Homework Statement The Effective Isotropic Radiated Power of an antenna is 60dBm. If the gain of the antenna is 30dB what is the input power to the antenna? (a) 3W (b) 2W (c) 4W (d) 5W Homework Equations EIRP = Power x Gain (in watts) EIRP = Power + gain (in dbm) The...

Homework Statement Which of the following are ways that catalysts can speed up reactions rates? You must check all answers that apply. A.) Increase the activation energy. B.) Decrease the energy of activation. C.) Change the path of the reaction. D.) Speedup the reaction without changing...

I heard this interesting paradox, which I haven't been able to find anywhere online! Now, bear with me while I set it up! Suppose a professor has a countably infinite number of students. This professor secretly assigns to each student a real number in the interval [0,1], and thus ends up with...

I am considering studying some form of Engineering at university next year, when I complete my IB Diploma. I am very interested in Physics and Mathematics but I find that I am more interested in an applied form of the two subjects and having just a B.S in Engineering or BEng would make me more...

I've been reading around and have come to a general consensus that nuclear research and applications have and will continue to decline. I know there's the thread in the nuke forums section about if nuclear energy is "good" or not, but I want a more specific answer to the career. I'm a...

A billiard ball has an initial speed of 5 m/s and it collides with another billiard ball of the same mass initially at rest. If the speeds of the two billiard balls are 3 and 4 m/s, then a) momentum was conserved but not kinetic energy b) kinetic energy was conserved but not momentum c)...

Hi Using the binary system for computing is a natural choice because of its two states: 0 and 1. But is this possible to use base 10, which is used in everyday matters, instead of base 2? Please remember that I'm neither a student of comp. science nor of science/math, in general. Thanks...

Wheeler's delayed choice experiment is a thought experiment proposed by John Archibald Wheeler in 1978. Wheeler proposed a variation of the famous double-slit experiment of quantum physics, one in which the method of detection can be changed after the photon passes the double slit, so as to...

Hello everyone, I'm new to this forum and I was wondering if you guys could give me some advice with school. I am currently a junior in high school taking 15 credits a quarter through a community college through a program in my sate called running start, I wish to acquire an Associate of Science...

Hey guys, I need some help with my colledge selection. I am still a sophomore in High School but I would like to know what would be a good colledge to attend to become a Astrophysicist. (If you do post a colledge could you also post what my GPA should be to get into the colledge and what i...

Hi all, I am a student in the final year of undergraduate course in Physics. Lately I learned about Photonics. I want to know whether it is a good choice to pursue my masters studies in it. I would be very much grateful if I am kindly informed. Also I would like to know about some good...

I know you all probably hate this sort of general question, but I'm kind of on a tight schedule so it can't hurt to ask. I am working on creating a prototype for a project which will require a rotating circular stand for an adult person to stand on which will then be capable of rotating at low...

Homework Statement [PLAIN]http://img697.imageshack.us/img697/9307/linvd.jpg The Attempt at a Solution Last condition = 1) ? How about the others?

Hello, I'm uncomfortable with the usual description of this experiment and wonder if this is justified. In a nutshell, when (in the usual double-slit setup) detectors are placed between the barrier and the final screen -- such that an electron, say, has already passed the two-slits -- an...

so basically i have a choice of staying in southern california or moving to PA (pennsylvania) next year. currently a sophomore in junior college and majoring in aerospace engineering and wanting to go into that field (obviously). can anyone give any info about both schools and career...

Hi, I have already completed a BSc in math in England, and am currently in applied math grad school, which I am not enjoying at all. I have decided I want to start afresh with engineering, and I am thinking of biomedical engineering ( second choice mechanical engineering ). I have had...

I am a high school senior and i would like to know what careers combine the health field and the egineering field as well as what majors i should choose in order to get on the right path towards the career.

Hello again I'm trying to decide on the correct heatsink for my project, but I'm not sure exactly what I'm looking at. On Digikey, each heatsink has values for Thermal Resistivity and Power Dissipation. This is the datasheet information for the MOSFET: Tj = -55 to +175 C Rds(on) = .02...

The standard definition of coordinates on Penrose diagrams seems to be something like \tan(u\pm v)=x\pm t. This is what Wikipedia gives, and Hawking and Ellis also give a transformation involving a tangent function, although I haven't checked whether the factors of 2, etc. agree. Neither source...

Hi I am currently an undergrad. studying electronics and communication engineering in India. I had no intention of studying that particular subject, but I chose it since I couldn't make it into a physics undergrad. programme (not because I'm bad enough academically, but due to some technical...

Which one would you choose and why? Math would probably be a good way to explain your choices.

In the paper "Double-Slit Quantum Eraser" by Walborn, Cunha, Padua, and Monken (see http://grad.physics.sunysb.edu/~amarch/Walborn.pdf and discussion of the paper at http://grad.physics.sunysb.edu/~amarch/ ), a double-slit quantum erasure experiment is performed with a delayed eraser. When the...

I need to quiz small study group. Looking for book/other-resources for difficult multiple choice questions on physics (motion, rotation, light, electro-magnetics etc.)

Homework Statement See the image http://tinypic.com/r/33z6vz5/7 Homework Equations The rules of dot product multiplication. The Attempt at a Solution I've determined that 2 of the solutions are valid, while two of the choices are invalid. I thought C and D looked correct, making A...

Hello .. I'm currently trying to choose my degree course and I'm having difficulty in knowing what to do. I know this will sound stupid but I'm terrified of taking IT and/or Science in University and failing in it. Technology in particular because Maths is hard to me and many if not all IT...

Hi! It's a real problem where we today have a steam throttle and would like to change it for a steam turbine/expander to provide some electricity. The problem is that the steam is at condensationline: 16 [bar] – T=201,37 [C] – h=2793,65 [KJ/kg]– s=6,4216 [KJ/kg*K] with an isentropic...

The title is the best way I could group this thought. And the following is most likely sloppy so I do apologize. I get the 'feeling' (subjective I know), that the measurement effecting the outcome i.e. only being able to measure position over velocity, collapsing wave functions, etc... comes...

I have N people and each of them has a uniform probability to belong to one of M countries. Now I wonder what is the distribution of the multiplicities?! I mean the number of countries with 1 person, 2 persons, 3 persons,... (no matter which country) Is there an equation for it? And what if...

I am currently a physics major at a mediocre local university(Coastal Carlina University) and I intend to get a Ph.D. in physics. Would it be better for me to stay here, and concentrate on a high GPA in the most advanced classes possible, or to transfer to a better university for my...

I'm currently a Junior in High School and have been thinking about possible career choices. It's definitely tough to find something that offers both money and satisfaction for the job itself. I've always been interested in physics and math, so I thought that theoretical physics would provide...

I read the following in a textbook I'm reading: If the total linear momentum of a system of particles is zero, then the angular momentum of the system is independent of the choice of origin. It was given without proof and I've been trying to see why this is the case - mainly intuitively...

As it says in the title, will anyone please give me the equation (in pre-algebraic terms) for discrete choice probability? I can see that the equation is P = Prob( Person n chooses Alternative i ) = G(xni, xnj(forall j inequal to i), sn, β), where xni is a vector of attributes of...

Hi The answers i picked are: 1)B 2)C 3)B 4)A 5)C 6)A Can someone tell me if my solutions from the attachment are correct. P.S