Recent content by manenbu

I've been reading lately about the origin of the elements and their production in stars and I have a few questions. Let's start by the simple stuff, and correct me if I'm wrong. When stars form and join the main-sequence they burn hydrogen to make helium. At a certain stage when the hydrogen...

Yes, apparently 2-1 became 0 in my first calculation. I got it correct now. Thanks!

Homework Statement function is: 1, -\pi < x< 0 2, 0 < x < \pi The Attempt at a Solution What I get is this: \frac{3}{2}+\frac{1}{\pi}\sum_{n=1}^\infty\frac{(-1)^n}{n}\sin{nx} According to the answers in the exercise sheet, it should be...

Homework Statement Taken from Resnick and Halliday: A Geiger counter has a metal cylinder 2.10 cm in diameter along whose axis is stretched a wire 1.34E-4 cm in diameter. If 855 V is applied between them, find the electric field at the surface of (a) the wire and (b) the cylinder...

Homework Statement From Resnick and Halliday: A metal plate 8 cm on a side carries a total charge of 60 microC. Using the infinite plate approximation, calculate the electric field 0.5 mm above the surface of the plate near the plate's center. Homework Equations (1) E =...

It means that the flux is equal to the charge inside the surface over e0. Ok. It came to me now. :)

2 questions: 1. A point charge of 1.84 microC is at the center of a cubical Gaussian surface 55cm on edge. Find \Phi_E through the surface. So here I was thinking, well the shape doesn't matter so the surface can be a sphere, so I calculated it for a sphere and it was correct (taking the...

I'm learning the subject of electric fields from Resnick and Halliday's book, and they have an equation for the field of the dipole: E = \frac{1}{4\pi\epsilon_0}\frac{p}{x^3} \left[1+\left(\frac{d}{2x}\right)^2\right]^{-3/2} Their next step is to find out what happens when x is larger than...

What does "doubly degenerate" mean, when discussing molecular orbitals?

Hello, I got a question about this famous graph of the spectrum given by a heated body, showing the classical line (which goes up) and Planck's line (which gives the hill shape). How is this line continuous? Let's say my body is a lump of hydrogen, the only points on the graph should be the...

Ok, thank you. It's just that some textbooks use either one, and none explain the difference. Now I understand!

I have a question which may seem stupid, but I think I missing something here. I see 2 equations describing allowed energies for electrons in hydrogenic atoms, being: E = -\frac{hcRZ^2}{n^2} And E = -\frac{RZ^2}{n^2} I assume that both are correct, but what makes the difference? Is it the...

C = \ln{|x|} + \ln{|y|} - \frac{x}{y} + y^2 That's the solution, in 2 different strategies. One using the integrating factor, second using your substitution. Thanks for pointing it out. :)

Ok! Solved it. Missed a little thing on my side. Thanks anyway! :)

I tried using the formulas: F(x) = \frac{\frac{\partial M}{\partial y} - \frac{\partial N}{\partial x}}{N} And then: \mu(x) = e^{\int F(x) dx} (there's also a similar one for y, with signs reversed and M instead of N in the denominator). Had trouble in the F(x) part - couldn't get a...