Recent content by Skeptic.

Homework Statement This isn't strictly a homework problem, but I didn't know where else to post this. I can't get the same derivation as my lecturer for the Doppler effect of light - which is shown in the attached file. If you cannot open this, I re-wrote it further down. Homework EquationsThe...

Homework Statement I want to find the following limit, ## \lim_{x \rightarrow \infty } x( \sqrt{ x^{2} +9} -x) ##, without using the Laurent series Homework Equations None. The Attempt at a Solution I used the Laurent Series to expand the square root, giving ## x((x+\frac{9}{2x})-x)##, then...

Where does ## \theta = \pi /4 ## come into it? I chose ## \theta = \pi /2 ## to maximise ## d\sin\theta## And isn't the 18o only applicable for the earlier part of the question, when you're effectively given ## \lambda ## as ##\lambda = hc/E ##? As when the wavelength changes, so will the angle...

Homework Statement A beam of 3.55keV X-rays is directed at a crystal. As the angle of incidence is increased from zero, a first strong interferece maximum is found when the beam makes an angle of 18.0o with the planes of the crystal. Calculated d=5.67x10-10 from this (distance between...

Hello, My name is Adam, and I've just started studying physics at university, so I thought it was about time I signed up for PF. I'm primarily on here for help, but I'll also do my best to help others!