Recent content by Mark Mendl

Thank you for the answer, but for exemple in a more specific question in this model : "We place a two-level atom with transition energy ħ*ω0 in a monochromatic laser field with frequency ω. The transition dipole moment is d = 3ea0. a0= 5.29 x1011 m. (a) Calculate the laser intensity needed to...

Homework Statement It's not a homework, I'm just studying for the exam, but one question that I'm not sure of the answer is: "In the semiclassical model of a two-level atom interacting with a monochromatic field, how does the Rabi frequency scale with the laser intensity" Homework Equations...

Hum... how would stay n(U.n)? cos(θ)U/r? probably not...

So I rewrite U = (Ucosθ, Usinθ, 0), my vr will be something like -3/4*R*Ucosθ(1/r+1/r3) - 1/4R3*Ucosθ(1/r3-3/r5)+Ucosθ ?

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Yes, actually when I solved it I used the equation for spherical and not that one, I put it wrong. (it's with both r squared). But I only used the radial direction in the fluid velocity... how do we have a latitudinal component if n and U only have terms in r?

Well, I think you can just calculate the initial energy E=mgh, assuming it was at rest before the fall. You already have the energy of one photon Ephoton=hc/λ, so the number of photons will be just E/Ephoton

To prove the divergence equal to zero, only the term in r exists, so we have I solved that but it's not 0, I guess the problem is in the n (U.n) term...

I'm not sure about the n (U.n) term, it stays just U/r2? Thanks, Mark

Using spherical coordinates (that is what asked in the problem I guess) and these equations

Homework Statement Let a spherical object move through a fluid in R3. For slow velocities, assume Stokes’ equations apply. Take the point of view that the object is stationary and the fluid streams by. The setup for the boundary value problem is as follows: given U = (U, 0, 0), U constant, find...