- #1
daudaudaudau
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How to Approach the First Exercise in Cohen-Tannoudji Volume 1?
- Thread starter daudaudaudau
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- #2
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This looks like a diffraction problem.
- #3
L'Aviateur
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Redbelly98 said:
I agree:
sin(θ)=pλ/l
here p=1
I don't know what to do with λ though...there must be some link between λ and energie...
keep in mind that the mass of a neutron is more like 1.67*10^-27 kg
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Welcome to Physics Forums L'Aviateur 
Yes, indeed there is. But we do need to let the OP do some of the work here, in accordance with the Forum rules and guidelines
L'Aviateur said:
Yes, indeed there is. But we do need to let the OP do some of the work here, in accordance with the Forum rules and guidelines
Hello everyone,
I’m considering a point charge q that oscillates harmonically about the origin along the z-axis, e.g. $$z_{q}(t)= A\sin(wt)$$
In a strongly simplified / quasi-instantaneous approximation I ignore retardation and take the electric field at the position ##r=(x,y,z)## simply to be the “Coulomb field at the charge’s instantaneous position”:
$$E(r,t)=\frac{q}{4\pi\varepsilon_{0}}\frac{r-r_{q}(t)}{||r-r_{q}(t)||^{3}}$$
with $$r_{q}(t)=(0,0,z_{q}(t))$$
(I’m aware this isn’t...
Hi,
I had an exam and I completely messed up a problem. Especially one part which was necessary for the rest of the problem.
Basically, I have a wormhole metric: $$(ds)^2 = -(dt)^2 + (dr)^2 + (r^2 + b^2)( (d\theta)^2 + sin^2 \theta (d\phi)^2 )$$
Where ##b=1## with an orbit only in the equatorial plane.
We also know from the question that the orbit must satisfy this relationship: $$\varepsilon = \frac{1}{2} (\frac{dr}{d\tau})^2 + V_{eff}(r)$$
Ultimately, I was tasked to find the initial...
Boundary conditions:
The derived Dirichlet and Neumann boundary conditions
In terms of the magnetic scalar potential:
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