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Home Q & A Board Science-Related Homework Help Physics
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staedtler staedtler
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7 years ago
In the present universe, the “mass density” of radiation, using Einstein's equation E = mc2 for the photons, is
A)   essentially zero since there is very little radiation left in the universe at the present time.
B)   much greater than the mass density of matter leading to a radiation-dominated universe.
C)   equal to the mass density of matter, since these parameters have remained balanced throughout the evolution of the universe as a consequence of the equipartition of energy.
D)   much less than the mass density of matter, leading to a matter-dominated universe.
Textbook 
Discovering the Universe

Discovering the Universe


Edition: 7th
Authors:
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papachulopapachulo
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staedtler Author
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7 years ago
I really appreciate your help!
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