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The critical mass density needed to just halt the
Chapter 34, Problem 28(choose chapter or problem)
QUESTION:
Problem 28PE
The critical mass density needed to just halt the expansion of the universe is approximately 10−26 kg / m3 . (a) Convert this to eV / c 2 ⋅ m3 . (b) Find the number of neutrinos per cubic meter needed to close the universe if their average mass is 7 eV / c 2 and they have negligible kinetic energies.
Questions & Answers
QUESTION:
Problem 28PE
The critical mass density needed to just halt the expansion of the universe is approximately 10−26 kg / m3 . (a) Convert this to eV / c 2 ⋅ m3 . (b) Find the number of neutrinos per cubic meter needed to close the universe if their average mass is 7 eV / c 2 and they have negligible kinetic energies.
ANSWER: