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What is the peak frequency of the Cosmic Microwave Background?

Using Wien's Displacement (#1) and then converting the wavelength of frequency (#2), I get 282 GHz.

#1. 0.0028977685 / 2.728 = 0.00106223185483871 Meters (1 millimeter)

#2. 299792458 / 0.00106223185483871 = 282228834161.183 Hertz (282 GHz)

This website seems to conclude that it's 160.4 GHz:

http://hypertextbook.com/facts/2004/HeatherFriedberg.shtml

Also, if something isn't a perfect black body, is there an easy way to get a more accurate result? Using the surface temperature of the Sun (5785) I get about 500 nanometers, which is green I believe. I imagined I should have gotten a frequency closer to yellow, around 570 nanometers.

Using Wien's Displacement (#1) and then converting the wavelength of frequency (#2), I get 282 GHz.

#1. 0.0028977685 / 2.728 = 0.00106223185483871 Meters (1 millimeter)

#2. 299792458 / 0.00106223185483871 = 282228834161.183 Hertz (282 GHz)

This website seems to conclude that it's 160.4 GHz:

http://hypertextbook.com/facts/2004/HeatherFriedberg.shtml

Also, if something isn't a perfect black body, is there an easy way to get a more accurate result? Using the surface temperature of the Sun (5785) I get about 500 nanometers, which is green I believe. I imagined I should have gotten a frequency closer to yellow, around 570 nanometers.

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