Physics Help Forum X-ray scattering
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 Nov 28th 2009, 07:35 AM #1 Junior Member   Join Date: Nov 2009 Posts: 3 X-ray scattering http://www.badongo.com/pic/7929865?size=original Why is it that the content in the brackets is zero? And how about this? http://www.badongo.com/pic/7929978?size=original I don't understand why the brackets are 4. And finally this one: http://www.badongo.com/pic/7930026?size=original Why are the brackets 4 and -4j?
 Dec 6th 2009, 08:44 AM #2 Senior Member   Join Date: Sep 2009 Location: india Posts: 409 i dont know how those horrible things are related to x rays but i can answer your question. SIMPLY USE e^(j theta)= cos theta + j sin theta like the first one, i am doing say.... 1 + cos(-pi) +j sin (-pi) +cos (-2 pi) +j sin(-2 pi) +cos (- pi) + j sin (-pi) remembering cos(-theta)=cos theta and sin (- theta)=- sin theta .....cos is even and sin is odd function i get 1-1+1-1=0 i think u can easily do the rest. please tell how these things are related to x rays? do they explain bremmstralung or characteristics?

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