Question: The cosmic microwave background ( CMB ) radiation has a temperature of 2 . 7 3 K . ( a ) What is the photon

The cosmic microwave background (CMB) radiation has a temperature of 2.73 K.(a) What is the photon energy density in the Universe? (b) Estimate the number of CMB photons that fall on the outstretched palm of your hand every second.

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