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Old Nov 28th 2009, 07:35 AM   #1
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Join Date: Nov 2009
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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?
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Old Dec 6th 2009, 08:44 AM   #2
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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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