Does light travel for ever?

  • Thread starter jsa0100
  • Start date
4
0
So from an electromagnetic source, will the photons travel "forever" or will some of them "collapse" after a while ?
 
229
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Are you talking about an electric/magnetic field (ie a magnet) or light (ie a flashlight)?
 
229
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I'm gonna assume you mean a flashlight.
In that case the photons will travel forever untill they get absorbed.

They will also lose energy over extremely long periods of time due to the expansion of the universe, but will never 'dissapear'.
 
4
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Sorry i ment Electromagnetic radiation (Radio and Light). By loosing energy do you mean that the wavelength will be longer?
 
229
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Sorry i ment Electromagnetic radiation (Radio and Light). By loosing energy do you mean that the wavelength will be longer?
Yes

(adding text because my post was too short)
 
229
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But remember that takes billions of years :)
 

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