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10/4/2012 4:36:13 AM
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Why doesn't light lag behind in motion?

Like lights at the front of a vehicle. Why doesn't it lag?
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  • It has no mass, and it isn't really connected to anything. It simply exists in the space where it is projected. A moving vehicle wouldn't effect the "speed" of the light coming out of the headlights.
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  • Light travels so fast that it can't lag unless that car was going faster than 299 792 458 m / s and that is impossible with modern technology
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  • There would be a minute doppler effect but it would still move at the speed of light in air (faster than the car).
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  • [quote][b]Posted by:[/b] ErranInfigo [quote][b]Posted by:[/b] DarkBen64 The speed of light is constant. [/quote] Ah no it is not. It is affected by gravity. Its moving slower on earth than it is in the void. Unless you mean its constant in a given circumstance.[/quote]ok, it's constant when travelling through the same states of matter- so yes, circumstance. Point is it doesn't change according to the Doppler effect.
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  • [quote][b]Posted by:[/b] DarkBen64 The speed of light is constant. [/quote] Ah no it is not. It is affected by gravity. Its moving slower on earth than it is in the void. Unless you mean its constant in a given circumstance. [Edited on 10.03.2012 10:48 PM PDT]
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  • ... Because the light from the bulbs are moving at over 299 Million m/s...
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  • The speed of light is constant. The Doppler effect for light only applies to its wavelength and thus colour, but not speed.
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  • Theoretically it does, but since it's so fast, it's probably impossible to notice.
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  • It does, you just cannot perceive it.
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  • Light disperses as fast as it travels, once the light source is gone, no more light in that spot.
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  • [quote][b]Posted by:[/b] chocolategiraffe [quote][b]Posted by:[/b] Doctor Swag [quote][b]Posted by:[/b] chocolategiraffe my IQ hurts... for the third time today[/quote] Your IQ must be incredibly low. [/quote] indeed, but this is probably the most mental assaults from the flood ive had in a while[/quote] Yet I was theoretically right and you were too stupid to read two pages of a thread.
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  • [quote][b]Posted by:[/b] Lifts Her Tail Because its like really -blam!- fast. [/quote]
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  • [quote][b]Posted by:[/b] Cheeto666 It does. It's just that here, on Earth, the distances are so minute compared to the speed of light, that the naked eye usually cannot observe the lag time.[/quote] More or less this.
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  • In simple terms with an analogy you'll understand... 1. get a buddy with a cap gun 2. stand approx. 1000m apart 3. use a stop watch to time the smoke vs. the sound you hear 4. this is the difference between light (seeing the smoke) and sound (what you hear in your ears) 5. This same principle applies to light but you'd have to use such a massive distance and accurate timer to see the affects. Essentially light travels so fast we're not able to detect the "lag" if you will.
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  • [quote][b]Posted by:[/b] Doctor Swag [quote][b]Posted by:[/b] chocolategiraffe my IQ hurts... for the third time today[/quote] Your IQ must be incredibly low. [/quote] indeed, but this is probably the most mental assaults from the flood ive had in a while
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  • [quote][b]Posted by:[/b] Doctor Swag [quote][b]Posted by:[/b] Lifts Her Tail [quote][b]Posted by:[/b] Doctor Swag [quote][b]Posted by:[/b] XGO MONSTROUS OP, google the Red Shift like now. Do it.[/quote] I was right![/quote] A bit. You were wondering why light doesn't 'lag' behind a vehicle. To achieve red/blue shifts you need to have a very large distance between the light source to notice the shifts. We're talking lightyears. [/quote] Oh. Well I was right in theory. [/quote] We'll give you that.
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  • Light is so fast the difference is almost imperceivable.
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  • [quote][b]Posted by:[/b] Lifts Her Tail [quote][b]Posted by:[/b] Doctor Swag [quote][b]Posted by:[/b] XGO MONSTROUS OP, google the Red Shift like now. Do it.[/quote] I was right![/quote] A bit. You were wondering why light doesn't 'lag' behind a vehicle. To achieve red/blue shifts you need to have a very large distance between the light source to notice the shifts. We're talking lightyears. [/quote] Oh. Well I was right in theory.
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  • [quote][b]Posted by:[/b] Doctor Swag [quote][b]Posted by:[/b] XGO MONSTROUS OP, google the Red Shift like now. Do it.[/quote] I was right![/quote] A bit. You were wondering why light doesn't 'lag' behind a vehicle. To achieve red/blue shifts you need to have a very large distance between the light source to notice the shifts. We're talking lightyears.
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  • [quote][b]Posted by:[/b] chocolategiraffe my IQ hurts... for the third time today[/quote] Your IQ must be incredibly low.
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  • my IQ hurts... for the third time today
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  • [quote][b]Posted by:[/b] XGO MONSTROUS OP, google the Red Shift like now. Do it.[/quote] I was right!
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  • Uh...what exactly are you asking?
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  • It does lag, but its so minute it's basically undetectable to the naked eye. [url=http://youtube.com/watch?v=nkbr-FItV00]heres something that you might find interesting.[/url] notice the difference in the waves inside the bottle and on the table it's resting on.
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  • [quote][b]Posted by:[/b] COLONELSANDERSW Go to school seriously.[/quote]His name is Doctor Swag, he doesn't need brain cells.
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  • OP, google the Red Shift like now. Do it.
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