The temperature of the universe at the time of decoupling of the cosmic background radiation was about 4500 K. At what wavelength in the electromagnetic spectrum did this initially decoupled blackbody spectrum reach its peak?

+1 vote
     about 644 nm, in the red end of the visible spectrum
      about 65 microns, in the infrared region
      about 60 m, in the radio portion of the spectrum
      about 50 nm, in the ultraviolet region
      about 6 picometers, in the hard X-ray region
asked Sep 20, 2012 in Astronomy by anonymous
    

1 Answer

+1 vote
about 644 nm, in the red end of the visible spectrum
answered Sep 22, 2012 by SkyStar ~Expert~ (2,855 points)



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