# Search results

1. ### What is a photon in respect to electromagnetic waves?

Wow okay, so I guess that means we're still at a standstill between consolidating the classical and quantum mechanical interpretations? Thank you Hydr0matic, you've helped clear up something very fundamental for me. I do have a couple more questions though if you're willing to stick around...
2. ### What is a photon in respect to electromagnetic waves?

I've always thought that photons and electromagnetic waves are one in the same. And I still do, but I'm trying to get a better grasp on the idea and am finding it difficult. 1) As I understand it, they are the same. But an electromagnetic wave with definite frequency is a perfect sine wave...
3. ### Any way to do this using simple matrix math?

Homework Statement The following notation is as follows: a comma ',' represents a column and a semi-colon ';' represents a new row. I have a vector: A = [a1, a2, a3, a4, a5] and a matrix B = [b1, b2, b3, b4, b5; b6, b7, b8, b9, b10; b11, b12, b13, b14, b15] What I want is...
4. ### Misc. SciAm's DIY Quantum Eraser: Not Real?

The way I see it (and take my opinion with a grain of salt because I'm just learning about the quantum eraser now and my background on quantum mechanics is pretty lacking), two waves purely polarized at right angles to each other don't interfere because the polarization itself gives the observer...
5. ### Learning without being spoon fed? (mod, move please?)

Thanks! It's good to know I can find them if I need to. Aside from the unfamiliar vocabulary though, I really wouldn't mind the uncertainties the authors had. It'd be nice to see how they eventually worked things out. Any suggestions for text in particular?
6. ### Learning without being spoon fed? (mod, move please?)

Learning without being spoon fed? edit: thanks mods --------------------------------- Is there a source, or does anyone have an idea how I can learn Physics without being spoon fed? I feel like whenever we were taught something new in my college Physics, we weren't given a chance to come...
7. ### Finding reduced chi^2 for independent variable?

Homework Statement I have a function V = kI where k is some constant I_err = 0.005 A V_err = 0.00005 V A fit was then made, but a problem occurs when I try to calculate the reduced chi^2. Since the error of the dependent variable V is so small, the resultant reduced chi^2 is fairly...
8. ### What exactly is the amplitude spectrum of the Fourier Transform?

Ahh, I think I get it. But by bin size I assume you mean a single individual bin's size and not the total number of bins right? Otherwise forget what I just said.
9. ### What exactly is the amplitude spectrum of the Fourier Transform?

I've already considered that but it doesn't explain why the amplitude of the Fourier transform grows so much larger as one decreases the interval between time steps. It also doesn't really make sense to me that the amplitude of the Fourier transform is ~250 or ~2500 when the amplitude of the...
10. ### What exactly is the amplitude spectrum of the Fourier Transform?

Homework Statement Not really a homework question, but related none the less. I'm confused about what exactly the amplitude spectrum is. As well as the power spectrum. Homework Equations Not really taking a purely mathematical approach here, I'm using numpy for python. Specifically the fft...
11. ### Thermodynamics: Gibbs free energy from this battery reaction?

Ok... thanks for the answers. Still horribly confused though. Hopefully some day soon I can look back a this and understand.
12. ### Thermodynamics: Gibbs free energy from this battery reaction?

So, in a reaction where the temperature were not constant, would dH be -394kJ? Then the temperature would drop; which would have to be made up for by entropy entering the system, by heat. Thus bringing dH to -316kJ? Also, what exactly do you mean by thermal energy? I'm I'm still way off base...
13. ### Thermodynamics: Gibbs free energy from this battery reaction?

Thank you for the response, but I'm still confused... you explained why it happens, but not how explicitly. The energy out of the reaction itself is only 316kJ. And 78kJ enters the system by heat. But with what mechanism does it leave the system? I don't think it'd be chemical because the...
14. ### Thermodynamics: Gibbs free energy from this battery reaction?

Thermodynamics: Gibbs free energy from this "battery" reaction? Homework Statement I'm reading my textbook and it gives an example. The dH of the reaction is -316kJ/mol so that much energy is released by the reaction itself. Additionally, the entropy of the products are higher than the...
15. ### Pulley with string attached to ground

Thanks for your help and patience. Cheers :smile:
16. ### Pulley with string attached to ground

Oh no, of course you can't tell me the answer; that would defeat the purpose. I hope you didn't take the statement in my last reply as resentment! Okay, I'll try again. Since the mass is at rest, the tension all along rope B is equal. So the tension to the left of the pulley and to the...
17. ### Pulley with string attached to ground

I'm feeling pretty dense right now... I don't get exactly what you're trying to imply (I do you know you want me to come to my own conclusion though, rather than spell it out for me). I'm taking it as the peg attached to the end of the rope is equivalent to the rope attached to the ground in...
18. ### Pulley with string attached to ground

I'm confused about your reply and I don't know if the confusion is on my side or yours... just to clarify by question, I attached a diagram. I'm wondering if rope A were pulled not rope B
19. ### Pulley with string attached to ground

Not exactly a homework question, but I need to know this before I can answer the question Homework Statement There's a pulley suspended from a rope A. Hanging from the pulley from one side is a mass m. "Hanging" off the other side of a pulley is simply the same rope (which is attached to...
20. ### Determine the following sets

Let me see if I've got it straight. The line on the y-axis from y=-1 to y=1 are also boundary points because for any ball from those points of any radius r there is a value for which x has a value in sin(1/x) and thus exists in G? Is that what you meant?
21. ### Determine the following sets

Okay thanks. I thought as much. Would you mind me asking one more? Setup: Graph of sin(1/x). This graph is subset of R^2 called G. Questions: Find G^int, Boundary of G, and closure of G Answer: G^int is empty set because the set G is a 1 dimensional line on a 2 dimensional plane, therefore...
22. ### Triple Slit Experiment?

Wow thank you for the detailed response. Though the complexity is going way over my head currently, I'll take some time over the weekend to try to understand what it all means. Anyway, I just wanted to give my thanks in the mean time.
23. ### Triple Slit Experiment?

Yes yes... quite right :redface:. Though my question still stands.
24. ### Triple Slit Experiment?

Would you possibly mind summarizing their experiment and results? That is, if it's not too long/complex/troublesome, in which case I'll read the paper myself. (I'm going to do it myself eventually, just swamped by homework right now).
25. ### Determine the following sets

I hate to do this, but I've actually answered the questions. It's just that it seems strange to ask the student questions with such answers, as well as giving so much space to answer something so simple, I feel like I've done something wrong. Homework Statement Let set Q represent all rational...
26. ### Triple Slit Experiment?

Thanks for the reply. I wonder if they've ever try to run the "measuring" experiment with diffraction grating? Would it affect the resultant spectrum? It's a lot of new information to take in though, so I'll have to take some time to digest it all. No other reply's here huh?... I would have...
27. ### Triple Slit Experiment?

Suppose that instead of two slits for the classical experiment, we use three slits. First what pattern would appear? I tried drawing it out, but without a protractor to draw proper curves, it's hugely inaccurate and I'm too lazy right now. Anyway, to the actual meat of the question, I was...
28. ### Help with D-Type flip flops?

Homework Statement In the Feynman Lectures on Computing, he uses this as an example of a D-Type flip flop. http://img526.imageshack.us/img526/1490/dtypeflipflop.jpg [Broken] Where the boxes are comprised of: http://img228.imageshack.us/img228/7421/flipflopt.jpg [Broken] And the \phi^{1} is...
29. ### Question about interference by observation (double slit exp.)

In the double slit experiment, under observation, the electron acts like a particle rather than a wave. From my understanding this is because the photon that hits it for observational purposes adds enough energy into the system to affect the electron and make it chose one single path rather than...
30. ### How do I convert CC-NOT gates to OR operators?

Ahh so simple. Can't believe I forgot something so basic. Thanks, you actually helped me clear up a whole other question as well.
31. ### How do I convert CC-NOT gates to OR operators?

Fredkin Gates are supposed to be universal. So far I've gotten AND, OR and NOT out of them but I can't figure out XOR. Any help? I know that A XOR B = (A AND NOT B) OR (B AND NOT A), but trying to recreate that with Fredkin Gates is not very elegant... is that the only way? Edit: I guess I...
32. ### What is the function of a collapsed wave?

What is the function of a "collapsed" wave? I know from observing the particle in a dual slit experiment the wave function collapses and the results becomes something like 2 lines, but is there a function that defines the two lines? Does it just collapse to a function of how the particles...

Cheers
34. ### Differential Equations of form y'(x)=f(ax+by+c)

Ahh substitution. It seems obvious now lol thanks. But can you tell me how you brought the 1/2 out of the last equation to get rid of the extra u? I can see that the last two equations are equivalent, but I don't understand the process. Did you just guess at taking -1/2 out? Or is there some...
35. ### Differential Equations of form y'(x)=f(ax+by+c)

I'll give it another shot. If i still can't figure it out in a while, I'll ask again? Edit: I think I solved it, but it's a little messy \displaystyle\int \frac{dv*(3 + 4\sqrt{v})}{9 - 16v} = \displaystyle\int dx \displaystyle\frac{-3*\ln{|9-16v|}}{16} + \frac{\sqrt{v}}{2} + c = x...
36. ### Differential Equations of form y'(x)=f(ax+by+c)

yeah, i was about to post that I'm a moron for not realizing such a solution a few moments ago... But now I'm stuck on how to solve \displaystyle\int \frac{dv}{3 - 4\sqrt{v}} = \displaystyle\int dx
37. ### Differential Equations of form y'(x)=f(ax+by+c)

Homework Statement My professor states that a differential equation of form y'(x)=f(ax+by+c) can be reduced to a separable equation by substituting in v=ax+by+c, but I don't see how. Edit: more specifically: y'(x)= sqrt(3x -4y +2) Homework Equations y'(x)=f(ax+by+c) v=ax+by+c The Attempt at...
38. ### Im looking for someone special

Now I'm actually interested in this tribdog guy. Why do his posts usually get taken down?
39. ### Im looking for someone special

My mistake. That was the weirdest sh** I've seen... today.
40. ### Good way to take physics notes?

Ahh book layout, perfect. In fact some other features I was looking for came along with the book layout so how perfect. Cheers! By diagram, I mean if I need to draw a diagram for my notes, it's kinda difficult without a tablet. Right now I'm using microsoft paint to draw them, but they look...
41. ### Good way to take physics notes?

Oh man... I spent a good 6 hours into the morning getting the program to work the way I wanted it to. And that's when I hit a stumbling block; diagrams :-\ I tried using paint, but they ended up looking like turds. And then I had another problem. Lyx labels my diagram as figure 1, when I want...
42. ### Im looking for someone special

... oh wow. Is this what they call irony?
43. ### Good way to take physics notes?

Pencil doesn't make a difference when you have to erase an entire paragraph because you accidentally left something out. And my ocd would never allow me to just tack on that info somewhere else. Yea thought of both tablet and latex. Tablet, too expensive. LaTex? Would definitely take too long...
44. ### Is Psychology and social science really a science?

Psychology doesn't really seem that scientific as of now (compared to more experimentally verifiable studies), but don't demean the whole thing. It's still young and it's got to start somewhere right? It's not like Newton said "When I throw this apple up into the air, the space-time curvature...
45. ### Im looking for someone special

Wait... I'm confused. So is pallidin tribdog or what?
46. ### I'm a skinny guy

Man... why did you have to say that. I'm crazy skinny now (not that I want to be), but I'm a lazy schmuck. Once those pounds start piling up, there ain't nothing I'm going to do about it. What a life. Going from underweight to overweight with just a short layover in Atlanta.
47. ### Good way to take physics notes?

Didn't know what section to really post this, but exam time approaches. And we all know what that means. That's right, procrastinate by doing the most mundane things just to avoid studying! Last year was adding lyrics and album art to every song on my iPod. Took about a good 8 days. This time I...
48. ### Trouble understanding matter as waves

ahh ok, I see. I don'e know the reasoning behind it yet, but at least I know there's an explanation up ahead. Thanks.
49. ### Trouble understanding matter as waves

Oh yeah, but I'm talking about a wave packet here. But even wave packets have points of value zero. At least how my textbook displays it. [PLAIN]http://vedantic-physics.com/web_images/wave_packet.jpg [Broken] How I'm interpreting this picture is that this wave squared is the probability of...
50. ### Trouble understanding matter as waves

Thanks for the reply, but I get lost half way through your post... I'll re-read it when I get further into my textbook. Edit: actually, I'm going to try to interpret what you said. So are you basically telling me, "yeah some points will have zero probability. This has been shown...