Season's Greetings

I can see that some can't see that red-shifting means moving in the direction from the blue to the red end of the visible spectrum which is applicable anywhere on the spectrum. What I can't see is why some can't see. I thought everyone had the ability to abstract from the physical? Or is that just pure mathematicians?
 
gomezz said:
I can see that some can't see that red-shifting means moving in the direction from the blue to the red end of the visible spectrum which is applicable anywhere on the spectrum. What I can't see is why some can't see. I thought everyone had the ability to abstract from the physical? Or is that just pure mathematicians?
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I think we know that. This is the 'Arms after all! :)
 
Black Hole said:
I think we know that. This is the 'Arms after all! :)
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Wind-up gomezz Arms?

"Low-shift" would be better, otherwise "down-shift." But "red shift" is a historical anomaly that needs to go. We don't talk about red-shifted sound waves!
 
I'm getting the feeling that this thread is taking place in 'The Cloud', as it obviously over my head! :eek: I used to believe I was fairly bright but I'm beginning to re-evaluate.:disagree:
 
RobH1 said:
I'm getting the feeling that this thread is taking place in 'The Cloud', as it obviously over my head! :eek:
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Cool! A monitor on the ceiling above your bed.:D
I used to believe I was fairly bright but I'm beginning to re-evaluate.:disagree:
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But on a serious note you must be at least a bit bright to be able to self re-evaluate if you are bright or not.:)
 
you can blue-shift an infinite wavelength as much as you like and still end up with an infinite wavelength
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The same would be true if you tried to red shift it. But if it were a frequency with infinite wavelength, it would not be a frequency but would be D.C. and I don't think that you could either blue or red shift D.C.
 
Black Hole said:
Just to be pedantic (what else?): you can blue-shift an infinite wavelength as much as you like and still end up with an infinite wavelength.
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There is no such thing as an infinite wavelength, just to be pedantic.
 
Yes there is. A plot of it is a straight line. Or are you telling us that you don't believe in infinity?
 
Trev said:
Yes there is. A plot of it is a straight line. Or are you telling us that you don't believe in infinity?
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I believe in infinity but not infinite wavelength or frequency.

So, at what height is your straight line?
 
What a silly question. :disagree: Everyone knows that lines do not have height, only length and in this case it's infinitely long. If you are talking about its position on the X axis of an X/Y graph, then it's indeterminate.:frantic:
 
Trev said:
Everyone knows that lines do not have height
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But with your definition, they have a height of zero. (Better called width.)


Have you never heard of thick and thin lines?:disagree: Or spectral lines? Or lines of people? Power lines?

Trev said:
only length
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Some lines do not have length. There have to be conditions for length to be defined.
 
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