aastrotech, we have seen that you can use the quote function. So, if you are quoting from somebody, it is polite to attribute the quote to that person. Not to mention that it makes reading your post easier to comprehend.
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Originally Posted by aastrotech
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Originally Posted by papageno
A spherical wave is the same in any direction (remember: "Isotropy is uniformity in all directions" and "Isotropic radiation has the same intensity regardless of the direction of measurement, and an isotropic field exerts the same action regardless of how the test particle is oriented" from your Wikipedia link), therefore it is isotropic.
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All directions means exactly that, ALL directions, not just all directions from a single point. It means all directions from all points. The "all points" is understood. Kind of like how in algebra AB is understood as one times A times one times B. When you learn algebra you learn that. When you learn about refraction you learn about isotropy.
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Please go to a library and read some physics textbook.
You will see that "isotropic" means that there is not preferred direction, just like in the definition of "isotropic radiator" that you quoted: "
It has no preferred direction of radiation."
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Originally Posted by aastrotech
You might want to look over Wiki's wave definition http://en.wikipedia.org/wiki/Wave
where it says "waves of electromagnetic radiation (and probably gravitational radiation) can travel through vacuum, that is, without a medium."
Which I already knew and is why I chose not to use the term medium in my OP. |
You must have forgotten to provide us examples for actual textbooks where they say something like: "electromagnetic waves travel through an electromagnetic field". After all, you claimed that "field" and "medium" can both used with same meaning.
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Originally Posted by aastrotech
Also read the wiki article "Field (physics)" http://en.wikipedia.org/wiki/Field_(physics)
Give yourself some time to mull this over but consider that your first replies to my OP were made 11 days after I posted and it is now 12 days untill the clock runs out on this thread. Stay on topic and we might get you to understand some things. |
Your condescending tone is out of place, considering that you tried to avoid my points. Also, the fact that you quote Wikipedia as a source is not encouraging.
So, what about the rest of my list?