Recent content by fatherdaly

Nah, I'm just not very on the ball on mondays.

Thanks! I can't believe I was being such a dunce. For clarification, this heating obviously takes energy from the wave. In doing so will the frequency of the wave be reduced (E=hf)? Thinking at a single photon level for radio waves seems a little silly.

I'm doing a study that involves radio waves passing through organic matter and have come across several sources that state that radio waves may heat organic matter when passing through it (For example: http://www.mobilfunkstudien.org/downloads/peleg_wm_10.5923.j.biophysics.20120201.01.pdf)...

Homework Statement http://i.imgur.com/j3uzQ.png" to screenshot of question Homework Equations The "Integral Form" the question refers to is the http://upload.wikimedia.org/math/0/3/1/0311484f33c932135c09ab12ca8d1a29.png" The Attempt at a Solution The hint hasn't really helped me...

Ok so I have the integral of v*exp(-\alphav2) dv between 0 and infinity to normalise. I don't know how a substitution would help because you would still have two functions multiplied by one another. Edit: I think I'm being stupid. I've substituted for alpha*v^2. Hopefully it will work.

Homework Statement It seemed much easier to screencap than to write out. Homework Equations It helps to know that the number of states with speed between u and u+du is 2pi*u du The Attempt at a Solution I've tried quite a few things but every time I get to trying to normalise I either get...

Thanks a lot for a fast reply. Yeah I've read up a bit on the allowed hkl values for copper which is FCC structure. I guess I'll play with the numbers until I get something similar to the answer.

Homework Statement A thin polycrystalline film of Cu, with lattice parameter of 0.361 nm, is irradiated with X-rays with wavelength of 0.154 nm. Calculate the first 5 bragg scattering angles for which X-rays may be detected.Homework Equations 2dsin(\theta) = n\lambda Bragg condition for...