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doit_the_clown doit_the_clown
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7 years ago
Light leaving a point source spreads out so that the apparent brightness I of light per unit area varies with distance d according to which of the following laws ( means “proportional to”)?
   A)  I = constant    B)  I  1/d2    C)  I  d2    D)  I  1/d
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Discovering the Universe

Discovering the Universe


Edition: 7th
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Only two things are infinite, the universe and human stupidity, and I'm not sure about the former.

Albert Einstein
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discovererdiscoverer
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