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• Users: Flucky
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1. ### Working out magnetic moment and electric quadrupole moment

I think I may be wrong about the electric quadrupole moments, it's possible that only protons contribute to Q. So because the only thing that changes with oxygen isotopes is neutron number Q will be 0 for all of them? EDIT: scratch that neutrons do actually contribute as they attract the...
2. ### Working out magnetic moment and electric quadrupole moment

Could somebody check if I have done this correctly please? 1. Homework Statement Draw the shell filling for oxygen isotopes and make predictions of their nuclear spin, parity, magnetic moment and electric quadrupole moment. Homework Equations Magnetic moment μ = gj j μN Electric quadrupole...
3. ### Compare & contrast properties of strong & weak interactions

For those who might read this in future, my lecturer came back to me with a few things more that should be said: Gluons are massless, leading to a long-range force. They couple to colour (carried by quarks) and also carry composite colour, so can interact with each other, which leads to...

Bump
5. ### Compare & contrast properties of strong & weak interactions

Hi all - in the question below I could do with some help on the "..explanation for the relative strengths..." bit, as I can't think of anything to say. 1. Homework Statement Compare and contrast the properties of the strong and weak interactions. Include in your account an explanation for the...
6. ### Calculate the wavelength of the n= 4 -> 3 transition in He

I had no idea the equation would differ. Just looked up 'Rydberg formula' and a Z2 appears. Big thanks, I was beginning to pull my hair out.
7. ### Calculate the wavelength of the n= 4 -> 3 transition in He

Homework Statement Calculate the wavelength of the n = 4 → 3 transition in 4He+ to an accuracy of 4 significant figures. (R∞=109 737 cm-1.) (Fine structure effects can be neglected.) Homework Equations \frac{1}{λ} = \frac{m}{m_e} R_∞ (\frac{1}{n_1^2} - \frac{1}{n_2^2}) where λ is wavelength...
8. ### Diffraction with a large array of slits

From the second equation it looks like as the slit width increases the angle between maxima will decrease. Am I able to set the two equations equal to each other? If so as slit width approaches slit separation the diffraction order will go to 1. Thanks for the reply btw.
9. ### Diffraction with a large array of slits

Hi all, exams soon and I'm stressing out over this small question. If anyone could guide me through, explaining why you're doing what you're doing that'd be beyond great. I posted this in the introductory thread but with no replies thought I should move it here (unsure of how to delete the other...
10. ### Thermal conductivity and Debye temperature

Hi all Homework Statement The Debye temperature of argon is 92 K and that of silicon is 345 K. Rank the following in order of thermal conductivity (largest value first): (i) A 1 cm3 cube of silicon at 6 K (ii) A 512 mm3 cube of silicon at 2 K (iii) A 1 mm3 cube of argon at 4 K (iv)...
11. ### Calculating entropy, microstate/macrostate probabilities

Hi BruceW, yeah turned out I was using the wrong equation so sending myself in circles. You were right I did need to use the Boltzmann entropy formula which came out with the correct result.
12. ### Calculating entropy, microstate/macrostate probabilities

Hi all, could somebody look over my answer please. I'm pulled the equation I used off the internet but can't remember where so I'm not sure what it's called. I took a picture of my answer as I thought it would be easier to read than fiddling with symbols here. QUESTION ANSWER ATTEMPT...
13. ### Why is the thick disc hard to study?

Ah I think it's clicked now, thank you
14. ### Why is the thick disc hard to study?

I just thought if that was the case it would be equally hard to study anything beyond the thin disc, including the Milky Way's halo, distant galaxies, deep space etc.
15. ### Why is the thick disc hard to study?

Bumpetty bump
16. ### Why is the thick disc hard to study?

Homework Statement As said in the title, why is the thick disc of our galaxy hard to study? The attempt at a solution I thought at first it may have something to do with the fact that the thin disc is so populated with stars that the light coming from it may interfere when trying to...
17. ### Kapteyn's and Shapley's Milky Way - a comparison

Note: delete this thread. No longer useful. Ta

milky bump
19. ### Kapteyn's and Shapley's Milky Way - a comparison

Hi all, new here and was wondering if you could help me out. I'm basically giving the two Milky Way models, and what was a common mistake (note it's a written piece not workings out) and I'd like to know if you think it makes sense/I don't waffle too much. Thanks in advance The attempt at a...