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No one has voted on this question yet :(
2 years, 10 months ago

What are the average and maximum lifespans of a photon?

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badaspie | 2 years, 10 months ago
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Once emitted, a photon is stable and lasts until it strikes an object and is absorbed. The maximum lifespan of a photon is the age of the universe, minus the 380,000 or so years it took for the universe to become transparent to photons after the Big Bang. The average lifespan of a photon would depend on the average density of photon-absorbing matter in the universe (more specifically, the mean separation between photon sources and photon absorbers), and I have not found any calculations or estimates for this figure.

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modenapsu | 2 years, 10 months ago
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A photon does not decay spontaneously in empty space. It is stable. 6 months is an unfounded answer. What is your source for the answer 'don5601'?

http://www.ee.buffalo.edu/faculty/cartwright/java_applets/cavity/photon_lifetime/index.html
-The photon lifetime is a time constant that describes the decay (or the growth) of energy in a cavity. We can calculate the photon lifetime by considering the rate equation (a differential equation with time as the independent variable) for the decay of an initial bunch of photons, Np, in the cavity. The applet IN THE ABOVE LINK shows a simple two mirror cavity with a pulse of photons bouncing back and forth.

Interesting article - http://blogs.zdnet.com/emergingtech/?p=517
source(s):
The Nature of Light: What is a Photon? (Optical Science and Engineering), by Chandra Roychoudhuri

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brainovermind | 2 years, 10 months ago Report

Thank you Modenapsu for the effort in the answer and links. It was a tough choice, but I finally went for badaspie for the best answer as explained above. This was a very helpful answer though. Thanks and take care.

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don5601 | 2 years, 10 months ago
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maximum life span of approximately 6 months, .

I think my red bull is kicking in!

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brainovermind | 2 years, 10 months ago Report

I'm hoping that Red Bull kicks in again soon. If you believe 6 months is a legitimate answer, I would love to see the sources that helped you figure that out. I can't vote you as unhelpful because the comment did help me get a chuckle. I just imagined you there typing away a million miles an hour with 50 cans of Red Bull littered around the computer. Quite a funny image, so I couldn't blame you for the quick answer.

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