Find the number of neutrinos per cubic meter needed to


The critical mass density needed to just halt the expansion of the universe is approximately 10-26 kg / m3.

(a) Convert this to eV / c2 ⋅ m3.

(b) Find the number of neutrinos per cubic meter needed to close the universe if their average mass is 7 eV / c2 and they have negligible kinetic energies.

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Physics: Find the number of neutrinos per cubic meter needed to
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