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  Discussion about math, puzzles, games and fun.   Useful symbols: √ ∞ ≠ ≤ ≥ ≈ ⇒ ∈ Δ θ ∴ ∑ ∫ π -

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#1 2011-03-30 01:41:28

John E. Franklin
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lumens/light

If a source of light is moved from 3 units
away from you to 9 units away from you,
without pollution in the space between
you and the light.    Why does the light
getting to your eyes drop by a factor
of 3 to the 4th power???  I just dreamt this
up???  See if you get the same result???


igloo myrtilles fourmis
 

#2 2011-04-17 06:22:16

John E. Franklin
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Re: lumens/light

Hint: don't think of a flashlight or a big light.
Think of tiny objects like stars in the night sky...
Because you might get a different answer either way
since, well I won't give it away.


igloo myrtilles fourmis
 

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