Recent content by aurora14421

Yeah, it's just the differential equation for SHM so that is the solution.

Thank you very much for all your help. Got it now.

I had, Q1, the heat absorbed, is: R T_2 ln(V_2/V_1) + 1.5R(T_2-T_1) And Q2, the heat lost, is: R T_1 ln(V_2/V_1) + 1.5R(T_1-T_2)

Homework Statement Derive an expression for the effiency of the cycle (of a Stirling Engine) working between two heat baths at temperatures T1 and T2 with volumes in the ratio V2/V1. Assume the working substance is a monatomic ideal gas. Homework Equations Work done=heat absorbed from...

The structure factor is proportional to the number of electrons in the atom (or the atomic number if the atom is uncharged).

In our notes somewhere (section 11/12/13), you can see that he uses the equation: Z(1) = (V/λ^3), where V is the volume. I'm not sure where it comes from, but I think we just need to learn it.

Yeah, thanks for the help. I got it too.

I think we do this question by showing that K transforms by a Lorentz transformation (since the definition of a 4 vector is a 4 component vector that transforms under Lorentz transformations). When you do this, you'll see K'=(v'/c, 1/lambda',0,0), once you substitute in what you got for v' and...

I'm stuck on the same question. I have the expression for the probabilities but I can't get the final expression they have. Any chance of another hint? I've been staring at this for a while and getting nowhere.

Sorry, I mistyped the question. It's fixed now. So there are only M possible sites on the surface and aV states when it's not on the surface.

Homework Statement N weakly interacting distinguishable particles are in a box of volume V. A particle can lie on one of the M possible locations on the surface of the box and the number of states available to each particle not on the surface (in the gas phase) is aV, for some constant a. 1...

Homework Statement A charge Q is placed at height b abouve a plane horizontal conducting slab. Write down the electric field, E(r), at a general point r above the slab (taking the point r=0 to be the point on the slab directly beneath the charge), and show that it satisfies the...

Ok, I see. So the atom recoils with the opposite momentum of the photon (-hf/c), since momentum is conserved. Thanks, I was just thinking about energy conservation.

Homework Statement An atom initially at rest emits a photon with frequency f. Explain why the mass of the atom decreases, and by an amount greater than hf/c^2. Homework Equations E= mc^2 E = hfThe Attempt at a Solution So I know that the atom must lose mass when the photon is emitted...

So it would have quantised energy inside the well (since it's confined) and continuous energies outside the well?