# 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 text book 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.