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yogesh
Posted:
Wed May 14, 2008 2:58 am
Joined: 14 May 2008
Posts: 1
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Does light or any electromagnetic radiation travel along its line of propagation for ever? or do they stop at some point of time. How come the law of conservation of energy does not affect its propagation. All the radiation travelling away from the centre of universe are draining it of energy in the form of electro magnetic radiation. Does this affect the universe in any way?
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dorado
Posted:
Sat May 24, 2008 5:13 am
Joined: 24 May 2008
Posts: 3
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Lines...Electromagnetic theory posits a wave nature to E-M energy. Doesnt waves propagate in a circular fashion, even a spherical manner. My take on E-M is that nothing in the electromagnetic world works in a linear fashion.
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dorado
Posted:
Sat May 24, 2008 5:27 am
Joined: 24 May 2008
Posts: 3
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Sorry, I didnt answer your question. These waves of E-M emanating througout the universe most usually strike matter and create more E-M energy, still equal to your conservation of energy law. As to your linear thinking of particles escaping and "draining" the universe, think of all of this energy bouncing about the cosmos like a huge echo chamber, but given the laws of conservation, of course. Radiation going here excites radiation going there, one big cosmic echo chamber. 
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sdhobbs
Posted:
Mon Jun 23, 2008 9:48 pm
Joined: 23 Jun 2008
Posts: 19
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Actually as light progresses I think it loses energy like almost anything else. Due to interactions with dust clouds and the very few particles in space and electromagnetic fields from planets etc. This would slow the particles. Not sure myself for certain but I'd suggest reading about the
phenomenon of "Red shift" for starters. This "Red shift" unlike modern "physics" (I use the term loosely in some cases) is not some theroretical crap but a discovered phenomenon for which answers were then sought, much the same as gravity.
I think it's something like as light travels it slows and becomes lower energy (yes that's right the speed of light is not actually completely constant, just too finite a difference for us to measure as mere mortals). This shifts light to the red end of the spectrum relatively as an object moves away from us when the effect is most pronounced.
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sdhobbs
Posted:
Mon Jun 23, 2008 10:02 pm
Joined: 23 Jun 2008
Posts: 19
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Think of it something like this, as a car is travelling forward at 60mph two passengers throw two identical weighted balls in opposite directions, one in the same direction as the vehicle motion and one backwards. The actual velocity of the two balls from a static point are different.
Will the ball thrown forward travel further and be "faster"? whilst the ball thrown "backwards" travel far less distance from the point of release?
Simple enough really. In theory due to basic mechanics on objects with mass, the ball thrown forward also has some of the forward momentum of the vehicle and so should travel further from the actual point of release whilst the ball thrown backwards with the same force has a negative effect from the forward momentum of the car and thrower and so travel less distance.
Thought for the moment: We are all supposed to believe this crap about the dilation of time (Time being an arbitary unit by which we measure our own short existences) yet we all check the clock in the car to see if we're late for work!
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hauritaz
Posted:
Sat Dec 05, 2009 7:28 am
Joined: 01 Dec 2009
Posts: 1
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If magnetic monopoles existed (ie akin to positive and negative charges, maybe you might have "north" and "south" monopoles), certainly you could. All magnets are dipoles, however.
I know if you vary the dipole moment you will generate radiation, but accelerating a dipole with a constant moment? No.
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