Recent content by daselocution

Hey all, The other day in O-Chem lab I tested trans-p-anisalacetophenone with the 2,4-dinitrophenylhydrazine test. I did not get the positive result that I expected. Is there any way someone could help me rationalize this? Would it have to do with the aromatic group in my compound? Did I...

Homework Statement For the following melting point, indicate what might be concluded regarding the sample purity: Melting point: 147ºC (dec.) Homework Equations I assume that (dec.) means that the sample decomposed. The Attempt at a Solution I am wondering if this means that...

I actually may have just asked a very dumb question. I just realized that by the definition given in my book, I can at least come up with the values of k given, though I still don't really understand what they mean. I saw that: k=2π/lambda = p/hbar = (p^2/hbar^2)^.5 = (2mE)^.5 / hbar. If...

Homework Statement Hey All, I'm hoping that you might be able to help me understand where the wave number "k" referred to in equations 6.62a and b below comes from. It makes sense to me that IF k=(2mE/hbar2) normally, that 6.62b would have E-V instead of E. That this change is made makes...

Could you please explain to me what you mean by the two independent polarizations for each mode? Does this mean that the standing wave could be sin or -sin? I guess I never really understood this when my professor mentioned it...

Ah thank you very much. I am glad to see that I am not quite as lost as I thought I was, your input is much appreciated!

Homework Statement Hey all, I am having trouble following some of the notes that my professor posted with regards to waves inside a blackbody; here is what he posted: (the part in bold is what I am just not understanding) "Inside the blackbody box, we need for the position of the walls...

Homework Statement Hey all, I am working through a derivation that my professor gave me to do and I am having trouble understanding one of the formulas that he gave me, namely: "EM waves can be described as: E(x, t) = Eosin(2πx/λ)*sin(2πc/λ)" The the Eo*sin(2πx/λ) term makes sense to...

Ahh thank you very much, I made a writing mistake with the second problem that I corrected in my homework. I didn't realize that the first solution was the solution--again, thanks.

Homework Statement Assume that the total energy E of an electron greatly exceeds its rest energy E0. If a photon has a wavelength equal to the de Broglie wavelength of the electron, what is the photon’s energy? Repeat the prob- lem assuming E = 2E0 for the electron. I need help with the first...

Thank you very much. That makes much more sense, I'm not really sure why I didn't just do that the first time. My mistake was not solving for Valpha' in terms of the other equations. Once I realized that I had to do that, it was much clearer.

Homework Statement I am basically wondering how they got to the assumption that the Ve = 2Vα. I've tried it a few times and I keep on getting that based off of their other assumptions, Ve should =0, even though I know that this cannot possibly be the case. Homework Equations Conservation of...

Homework Statement This is not a problem I was assigned, I am just trying to figure out how I could prove it to myself. Basically, I am just wondering WHY the gamma value for relativistic momentum takes the form that it does, namely (1-u^2/c^2)^-.5 I've tried to prove this to myself a...

Ahhh thank you for clearing that up. I don't think I actually fully understood what I was getting into with the first attempt...

Homework Statement This is the problem as stated in my textbook: Prove that for a timelike interval, two events can never be considered to occur simultaneously. I thought about two different ways to go about this; both of these ways make sense to me, but I'm not sure if they both make sense...