Actually, the question came up in a statistical physics exercise, where we were asked to calculate the pressure of a photon gas confined to area A=L^2. And you need the number of polarization states when you change a sum to an integral. My theory is that the lecturer was lazy and just changed...
Hi,
I stumbled upon this dilemma in a homework problem which involved 2D photon gas (unphysical, I know). How many polarization states are there for EM-radiation confined to 2D? In 3D it's 2, but how does it work in 2D? An EM-wave propagating in the z-direction can have its E-component...
Homework Statement
As a part of a lab report, I need to calculate the distance of the (111) planes of an FCC lattice made out of spheres with diameter D.
Homework Equations
The Attempt at a Solution
The course assistant has given me the value of \frac{\sqrt{6}}{3}D. I can...
Hello all,
I've programmed a GUI to read and plot data from oscilloscope. I have a timer function that updates the graph at 1 Hz frequency.
What I want to is to add two vertical lines to the same figure that mark the beginning and end times of CCE measurement. For that purpose, I'm using the...
I got the devices working now. The problem with the pressure gauge was that someone had changed the baudrate from the default value and that I had to first send an <ENQ> and the read. The cooler required an <STX> at the beginning of the message, and once I figured out how to send that it began...
I know the pressure gauge uses COM5 and the cooler is connected to COM6. If I click 'Connect' in the Test & Measurement toolbox I can connect to both ports, but Matlab cannot identify any devices. If I try to send a query to either device, I get no response before the timeout.
The datatype for...
Thanks for your reply. I haven't built the setup myself, and I think I should not change it in any way. I know that at least the cooler works, I tried it using the old LabView software. The oscilloscope I have here uses a TCP/IP connection, so I can't try the serial port with that.
I don't...
Hi,
I have a cooler and a pressure gauge which I need to operate from Matlab. Both devices are connected to the computer via a serial port. I've been using the Matlab Instument Toolbox Test & Measurement tool to try and communicate with these machines. The problem is that I don't get any data...
Hi,
this is not actually a homework question, but as it has mostly to do with computer science, I thought this would be the appropriate place.
At work we have a measurement setup which is currently controlled by a LabView program. My task is to move the code from LabView to Matlab. I don't...
Homework Statement
x'=f(t,x)
k_1=f(t_n,x_n)
k_2=f(t_n+2h/3,x_n+2h k_1/3)
k_3=f(t_n+2h/3,x_n+h(k_1+3k_2)/6
x_{n+1}=x_n + h(k_1+ k_2+2k_3)/4
Prove that the above Runge-Kutta method is of third order by examining the problem
x'=x, \; x(0)=1.
Homework Equations
The Attempt at a...
Homework Statement
Prove that the number of electrons whose velocity's x-component is between [x,x+dx] is given by
dN = \frac{4\pi V m^2 k_B T}{h^3} ln [exp(\frac{E_F -mv_x^2/2}{k_B T})+1]dv_x
Homework Equations
The Fermi-Dirac Distribution function:
\frac{dn}{dE}=\frac{4\pi V...
Hi,
at my Uni we have a lab course where we first take some measurements and then write a report about the experiment. Our current experiment was about microwave diffraction. First, we measured the wave length of the microwaves, and then proceeded to measure the intensity of the scattered...
Hi,
I don't know if this is the right place, but I figured there'd be people here who know a thing or two about the said calculator model. My TI-86 is and old one (ca. 5 years). I didn't use it in the summer, and when I took it out again, there were multiple dead lines on the LCD screen. Is...