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 Be the first pioneers to continue the Astronomy Discussions at our new Astronomy meeting place...The Space and Astronomy Agora Re: Absolute Nothing Does Not Exist Forum List | Follow Ups | Post Message | Back to Thread Topics | In Response ToPosted by Zephram Cochrane/">Zephram Cochrane on February 8, 2000 21:39:29 UTC

: : We do not pretend, but do understand the propagation of electromagnetic waves. Its not a very complicated phenomenon. If you don't that's your problem.

: 0KAY SO YOU KNOW PLEASE ANSWER THIS : WHATS A ELECTROMAGNETIC WAVE 0KAY ? : IF THERE IS A NO MEDIUM (ABSOLUTE NOTHINGNESS IS TERMED USED )TO PROPOGATE THEN HOW DOES IT TRAVEL.

Simple, 1.) ÑXE = -B/t (Translation, a changing magnetic field creates an electric field in vacuum)

2.) ÑXB = m0e0E/t (Translation, a changing electric field creates a magnetic field in vacuum)

3.) Ñ×E = 0 (Translation, we have no electric charge sources of the electric field being in vacuum)

4.) Ñ×B = 0 (Translation, no magnetic monopoles)

Take the curl of (1.) 5.) ÑX(ÑXE) = ÑX(-B/t)

A little manipulation 6.) ÑX(ÑXE) = (-/t)(ÑXB)

Inserting (2) into (6) 7.) ÑX(ÑXE) = (-/t)(m0e0E/t)

A little manipulation 8.) ÑX(ÑXE) =-m0e02E/t2

A little vector calculus 9.) Ñ(Ñ×E) - Ñ2E = -m0e02E/t2

Refer to (3), then (9) becomes Ñ2E = m0e02E/t2

This is a wave equation for an electric wave of speed c = 1/(m0e0)1/2

In other words its because a changing electric field creates a magnetic field and because a changing magnetic field creates an electric field in this manner that the electric field propogates as a wave without a medium. One can use the same kind of method with the same equations 1, 2, 3, 4 to arive at Ñ2B = m0e02B/t2

I have gone far beyond the basics like these things.

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