Recent content by freefallin38

  1. F

    Estimating Temperature of Universe at Deuteron Disassociation?

    ohh ok, i got it now. i just had some trouble with using the right masses haha. thank you so much!
  2. F

    Estimating Temperature of Universe at Deuteron Disassociation?

    Ok, so calculating that would give me 1875.6 MeV for he 'ionization energy' of the deuteron. Then, when I set it equal to kT, I get 2.177e13K, which still isn't the right answer. Am I on the right track at least?
  3. F

    Estimating Temperature of Universe at Deuteron Disassociation?

    I got it somewhere online, and it didn't seem right. I can't think of any other way of going about the problem though, and I can't find any other value for that ionization energy.
  4. F

    Estimating Temperature of Universe at Deuteron Disassociation?

    Ok, I have this homework problem that is driving me nuts, and I only have a short period of time to get it. The question is, Estimate the temperature of the universe when it has cooled enough that photons no longer disassociate the deuteron. There was another part that asked for the...
  5. F

    What Are the Energy Levels and Degeneracies in a 3D Infinite-Potential Well?

    right, thank you! the third level is degenerate because you can have different wave functions, because you could also have n1=n3=2, and n2=1, and so on, right? Then the fourth and sixth levels would also be degenerate.
  6. F

    What Are the Energy Levels and Degeneracies in a 3D Infinite-Potential Well?

    For the third, fourth, fifth, and sixth levels of the three-dimensional cubical box, find the energies in terms of the quantity E0= π^2*hbar^2/(2mL^2), where m is the particle mass and L is the box's sidelength. _____E0 (third level) _____E0 (fourth level) _____E0 (fifth level) _____E0 (sixth...
  7. F

    Calc K-Shell X-Ray Series Wavelengths for Zirconium Atom

    Calculate the three longest wavelengths and the series limit for the K-shell x-ray series of the zirconium atom. (a) λ(Kα) = 79.8832 pm (b) λ(Kβ) = 67.401142 pm (c) λ(Kγ) = 63.90653 pm (d) The series limit is _____ pm So I have solved parts a-c. For part d, the series limit, I tried...
  8. F

    Electromagnetic radiation and photons

    I can't find f' for problem 3. I thought that because the problem said it wanted the maximum value, that would make \vartheta =180. Using the formula 1/f'-1/f=h/mc*(1-sin\vartheta) to find f' and then when I used the conservation law, I just got the same original value of 64keV. If \vartheta...
  9. F

    Electromagnetic radiation and photons

    ok, so the conservation law is hf+mc^2=hf'+E(electron) in problem 3, I have 64kEv+mc^2=hf'+E, but how do i find the f'? I have a feeling that if i can get 3, 4 will be easy to solve
  10. F

    Electromagnetic radiation and photons

    ok, so now I have the answers for 1 and 2. For 3 and 4 I'm still stuck about how to solve them..
  11. F

    Electromagnetic radiation and photons

    is E=h*f the energy for one photon?
  12. F

    Electromagnetic radiation and photons

    [SOLVED] Quantum Theory questions... I have been having a bit of trouble on these homework questions 1)How many photons/s are contained in a beam of electromagnetic radiation of total power of 165 W when the each of the following is the source. (a) AM radio station of 990 kHz...
  13. F

    What is the relationship between speed and momentum increase?

    [SOLVED] Simple Momentum problem A particle initially has a speed of 0.47c. (a) At what speed does its momentum increase by 1%? .4747c (b) At what speed does its momentum increase by 10%? ____c (c) At what speed does its momentum increase by 100%? ____c To get the answer...
Back
Top