Concept explainers
The peak intensity of the CMBR occurs at a wavelength of 1.1 mm. (a) What is the energy in eV of a 1.1-ram photon? (b) There are approximately 109 photons for each massive particle in deep space. Calculate the energy of 10^ such photons, (c) If the average massive particle in space has a mass half that of a proton, what energy would be created by converting its mass to energy? (d) Does this imply that space is "matter dominated”? Explain briefly.
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