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Imagine two boxes, one a "true"blackbody radiator (such as the box with
aluminum foil referred to by John D.) and the other a collection of
tunable lasers. These lasers are tuned and have intensities in such a way
that when someone plots the intensity verus wavelength of the light coming
out of the box the resulting curve matches that of a blackbody.
Now if a thermometer is used to measure the temperature inside the two
boxes the temperature of the first box, the one with the "true" blackbody
in it, will correspond to the peak wavelength according to Wien's law,
whereas the second will not.
This is an apparent paradox to me. What is wrong?
Justin Parke