Hello,
Im not sure if it is the right place to ask it but anyway ...
i got this function:
\begin{equation}
M(t)=\sum\limits_{q=1}^N \frac{v^2}{N+ \frac{1}{2}} \cot^2 \left(\frac{\alpha_q}{2}\right) {\sin^2\left(\sin\left(\frac{\alpha_q}{2}\right)t\right)}
\end{equation}
where:
\begin{equation}...
Hello ,
I tried to solve this coupled ODE but with no success
Does anyone know if there is an analytical solution to this equation?
my problem is with the first & the second equations the term g*f is the my biggest problem i think
once i have the solution for g - the solution for h is...
the electron moves λu while the light moves λ≈λu /β
so the difference is λu [1/β-1]
so how can I use this fact to find the wave length?
I tried use the approximation β≈1-1q/(2*γ^2) for ultra-relativistic electrons
but still didnt get the right answer...thank you
Homework Statement
Homework Equations
2. (b)
I didn't understand how can I find the app. wavelength
The Attempt at a Solution
I tried : the electron move over λu with velocity β so the wavelength is λ≈λu /β
but its not the right answer.
my lecturer told me I should...
so I have another question - what makes the water act like a gas ? I know that the evaporation temp. at room pressure is ~ 100 C , so if the temperture is < 100 and the pressure is ~ 1 atm why the water are gas?
thank you
Hello ,
I was always wondering about this phenomenon :
when i take out a cold bottle from the refrigerator , after a few seconds (lets say at room temperature) the bottle is surrounded by water.
the question is - why is it? where did the water come from ?
is it should happen with...
Homework Statement
I uploaded a picture with the question
Homework Equations
my problem is :
How should I find all the symmetries of the action ?
Is there an easy way to recognize those symmetries or should I try all the symmetries I know and see if the action doesn't change...
but according to the defination of the electric field , any coherent state will lead to such an expectation value because it's an eigen-state of the annihilation operator.
I still don't understand where is it given ?
it's just a "new name" for <Ex> , isn't it?
of course the expectation value won't be an operator... so I don't see what's so special here or what should I do ...
or f(r) is a known function in Electrodynamics that i should know ?
Thank u ...
\HugeHomework Statement
Consider a state of the EM field which satisfies
\left\langle \textbf{E}_x(\vec{r})\right\rangle =f(\vec{r})
Find a coherent state which satises these expectation values.Homework Equations
\textbf{E}(\textbf{r})=\frac{i}{\sqrt{2 V}}\sum _{\textbf{k},\lambda }...
Homework Statement
Find the density of states g(ε) for an ideal quantum gas of spinless particles in dimension d with dispersion relation ε= α|p|s , where ε is the energy and p is the momentum of a particle. The gas is confined to a large box of side L (so V = Ld) with periodic boundary...
Prove that the following two statements of the second law are equivalent (each one can be derived from the other):
(a) “It is impossible for heat to flow spontaneously from a colder to a warmer body without causing other changes”
(b) “It is impossible to convert all the heat taken from a...
I don't understand something -
there are lots of functions that can be perpendicular to psi
e.g (euclidean space)- the vector z (cartesian coordinates) , x is prep to z and y is prep to z but also the superposition (x+y) is prep to z.
so by writing psi prep do u mean to the superposition...