Recent content by elevenb

Hi everyone, I've been given a problem where I have to index reflections from a cubic lattice, the procedure is simple enough but I'm getting a case where I get : h^2+k^2+l^2=7 I've taken to many books, but most either don't mention the topic or say they are simply 'forbidden' reflections. I...

Homework Statement Having recently completed an experiment on Young's double slit experiment for both high and low intensity light; I am having trouble writing conclusions in the report. In one part of the experiment I know I was firing only one photon at a time down the tube, and I achieved an...

I'll give an example: For K, given d=14cm and a=1.4cm , I get a value of 6.11 2 \pi d^2=1231.5 with a relative error of 1.4% \frac{2\pi d^3}{\sqrt{a^2+d^2}}=1225.4 with a relative error of 2.3% However when I take one from the other I get K=6.11 with a relative error of 536% Is there anyway to...

I have noticed that when doing some error propagation, that even though the two parts to K have small relative errors, since the two parts are so similar, when I subtract one from the other, the relative error is huge! Is there any way to correct this?

Apart from an extreme outlier at d=0.5cm, the data now gives me a value a lot closer to the inverse square law! Thank you!

Ahhh, no I havent, I just plotted the countrate! Doing that should get a value closer to the ISL?

I have two cylindrical sodium iodide detectors with a radius of 1.4cm, the experiment was set up so as only gamma radiation from positron annihiliation was recorded and the distances between the two detectors vary from 1-30cm. Hence the source-detector distance was 0.5-15cm. I'm not sure how I...

Looking at my math, you'd wonder why I am even asking this question! Sorry, it's been a long few days! I think that's correct now?

According to Knoll, when d>>a it tends to Ω → K/d2 as you have said, where K=\pi a^2 In the original equation if I factor out 1/d2, I get \Omega = \frac{1}{d^2}(2\pi d^2-\frac{2\pi d^3}{\sqrt{d^2+a^2}}) In this case K(a,d) is the term inside the bracket, correct?

I know that at large distances from the source the a term becomes negligible and the detector becomes point like, hence giving the 1/r^2 dependency; however I'm just not sure how to correct for the finite size of the detector at ranges where I can't neglect the size of the detector.

Sorry, some bad latex skills on my behalf there. Should be ok now.

Homework Statement Recently I have conducted an experiment using a gamma source (22Na) and a scintillation detector (NaI), at the start of the experiment one of the desired outcomes was to see that the intensity of the source fell off as 1/r^2. Seeing as the detector is not point like (I am...

Hey, sorry if this is in the wrong section. I am looking for a tabulated value magnetic susceptibility of some metal salts; Sodium thiosulfate in particular. Could someone point me in the right direction? Thanks

Homework Statement I have been working on a lab report recently in which I took some data and then further used this data to gather results. I was plotting magnetic flux density as a function of current, this turned out to be an exponential saturation curve. I plotted this curve using a...

I know who did it first! I'm just wondering how the more accurate measurement that we have today came about?