How far from the lightbulb can you stand to see it? photon problem

  • Thread starter okgo
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Delphi51
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Looks like an interesting problem, okgo.
And you have a good start.
Those photons are spread over the surface area of a sphere at distance R from the light bulb. You should be able to write an expression for the number of photons per square meter at radius R. Equate that to the specified 20 per (area of pupil).
Then you can solve for R.
 

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