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Author Topic: Does light have mass?  (Read 8169 times)

Offline lightarrow

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Re: Does light have mass?
« Reply #25 on: 29/01/2013 00:54:03 »
Maybe?
Are you defining a single photon/lightquanta as having a spectrum Lightarrow?
Exactly. How broade its spectrum is, depends on how short was the time interval of its emission: a photon emitted by an axcited atom's electron which returns in its fundamental state in 967878d1da852d4b07a961e3168b0fff.gift seconds has a spectrum which broadness is proportional to 1/967878d1da852d4b07a961e3168b0fff.gift. Lasers use electronic transitions called "metastables" because they are so stable the transition occurs in a much longer time; this means that the spectrum is very monocromatic
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That should be from a wave perspective if so, right? As you say it has what we call Spin/polarization but thinking of it, all of those definitions come from treating photons as waves, don't they?
To say "treating them as waves" is very restrictive; you should say "treating them quantomechanically" (which is the only way to treat photons, at least to me, but this is still under discussion  ;) ).
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You made me think, and wonder, some more there Lightarrow :)
How many photons does it take to measure a linear polarization? 
Photons never stop to amaze me too...
« Last Edit: 29/01/2013 00:58:43 by lightarrow »
 

The Naked Scientists Forum

Re: Does light have mass?
« Reply #25 on: 29/01/2013 00:54:03 »

 

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