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How many days does it take for a perfect blackbody cube (0.0379 m on a side,...

How many days does it take for a perfect blackbody cube (0.0379 m on a side, 14.6 °C) to radiate the same amount of energy that a one-hundred-watt light bulb uses in one hour?

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Answer #1

That is a pretty small cube:

       1 cm^3 -- about the size of a lump of sugar.

At area of all sides together is

. The absolute temperature is T = 303 K.
According to the Blackbody radiation law, the power radiated is

A 100W bulb uses 100 Joules in one second, which is 3.6*10^5 J in an hour.

The cube will need

      

days to radiate that amount of energy.

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