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Given the z redshift of 1089, and the temperature difference between then and now of about 1089, I tried scaling the ev, freq. and wavelength by 1089....

Is that right?

I get a freq. of about 240 Terahertz, 1.25 micron wavelength and almost exactly 1 ev of photon energy.....

Does that correspond to a blackbody temperature of just under 3000 K?

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  • $\begingroup$ I just went to Omni's online black body calculator and got 965 nm (or .965 micron) wavelength and THz for freq., after typing in 3000 K. Is that close enough? $\endgroup$ – Kurt Hikes Aug 10 '20 at 12:29
  • $\begingroup$ In the above comment, I meant 180 THz. $\endgroup$ – Kurt Hikes Aug 10 '20 at 12:38
  • $\begingroup$ I know the Omni Wien's black body calculator's 'peak frequency' doesn't match it's 'peak wavelength' precisely.... Maybe because 'spectral radiance' peak values are different if you start with freq. than if you start with wavelength... (See Wikipedia article on the CMB if confused...) $\endgroup$ – Kurt Hikes Aug 10 '20 at 12:43
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    $\begingroup$ Orange. See physics.stackexchange.com/a/133943/123208 $\endgroup$ – PM 2Ring Aug 10 '20 at 14:01
  • $\begingroup$ I thought more people would be curious about this... $\endgroup$ – Kurt Hikes Oct 1 '20 at 15:45

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