Re: [Phys-l] g & E fields

[William Maddox <maddox@physics.Auburn.EDU>]

From: WC Maddox

The human eye/brain cannot detect light variations on the time scale 
of one period of a light wave. The intensity we observe is determined 
by the average value of the Poynting vector. For a sine wave type 
variation of electric field the average is proportional to 1/2 of 
square of E(max). For two waves of equal amplitude and in phase, 
E(max) = 2 x E(peak of one wave). See Sears and Zemansky for further details.

End Message







At 08:27 PM 1/6/2008, you wrote:
> At 08:02 PM 12/3/2007, you wrote:
>
> >Here is another tricky question on the energy of the electromagnetic
> >wave: Is the intensity of the bright fringe (For example, Young's
> >Double Slit Experiment) always the same when the electromagnetic field
> >is varying? Neither is this question easy to be explained too.
> >
> >