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### Calculate temperature of the earth through blackbody radiation

I don't understand the solutions to a problem about blackbody radiation and was wondering if anybody could help me out. Here is the question: The sun can be considered as a blackbody radiation ...
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### Inverse Square Law and extra space dimensions

Newton's famous Inverse Square Law says that in $n=3$ dimension of space, force is inversely proportional to the square of the distance between a source and a target. I understand that for higher ...
Feynman starts the derivation of Gauss law by stating the it depends specifically and directly on the fact that force law is inverse square. Does it mean that if electric force law varied as $1/r^3$,...