What was the approximate number density of CMB photons when the CMB had a higher temperature of 507 K? (Hint: You can assume that photons in a thermal distribution have a mean energy of 3kT).
What was the approximate number density of CMB photons when the CMB had a higher temperature of 507 K? (Hint: You can assume that photons in a thermal distribution have a mean energy of 3kT).
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What was the approximate number density of CMB photons when the CMB had a higher temperature of 507 K? (Hint: You can assume that photons in a thermal distribution have a mean energy of 3kT).
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