In the Present Universe, the "Mass Density" of Radiation, Using

question 161

Multiple Choice

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.

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