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64. The cosmic background microwave radiation which pervades the universe hasthe characteristic radiation from a blackbody at temperature 2.9" K. To whatfrequency does it refer toa) 3x10' Hz b) 3x10 Hz c) 3x10 Hz d) 3x 10'll

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I am not totally sure the right answer a 3×10^4

option a is the correct answer of the given question



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