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Black-body radiation has the interesting property that it is invariant under redshift. I.e. a redshifted black body spectrum stays a black body spectrum, but fo
by kmm 10y ago
Black-body radiation has the interesting property that it is invariant under redshift. I.e. a redshifted black body spectrum stays a black body spectrum, but for another temperature
- andrewflnr 10y agoIs black-body the only spectrum for which that's true, i.e. could you (in principle) define it that way?
- kmm 10y agoNo, it's true for any spectrum which is a function of the ratio of frequency and temperature, as we can then shuffle the factor appearing due to redshift into the temperature. Apart from any constant prefactors, because those don't change the shape of the spectrum but just its absolute value.