
#1
Sep2410, 02:13 PM

P: 4

in
E = E_0exp i(k dot r  wt) or E = cos(k dot r  wt) what does k dot r physically represent? Can r be any position in space or must it lie on the wave? (I physically understand what a dot product is) 



#2
Sep2410, 03:06 PM

P: 675

That's a plane wave, it occupies all of space.
If you want a beam that is localized along a line, E_0 has to be a function of distance from the line. 



#3
Sep2410, 05:19 PM

Mentor
P: 11,221

http://www.physicsforums.com/showpos...90&postcount=6 


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