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13) The cosmic background radiation permeating the universe has the spectrum of a 2.7-K blackbody radiator. The energy densit

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solution: T=2.7K U=4.19 X1085/cm3 a. using wiens displacement law AMT = 2.89777 X103 m.K. 2.89777 xro3 1.073x10^ºm 2.7 b. Ene

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