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College Physics

1st Edition
Paul Peter Urone + 1 other
ISBN: 9781938168000

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Chapter
Section
BuyFindarrow_forward

College Physics

1st Edition
Paul Peter Urone + 1 other
ISBN: 9781938168000
Textbook Problem

The critical mass density needed to just halt the expansion of the universe is approximately

(a) Convert this to

(b) Find the number of neutrinos per cubic meter needed to close the universe if their average mass is

and they have negligible kinetic energies.

To determine

(a)

The critical mass density in terms of eV/c2m3.

Explanation

Given:

Critical mass density, ρ=1026kg/m3

Calculation:

Consider the conversion factor to convert the critical mass density in eV/c2m3.

  ρ=1026×9×1016×(1 1

To determine

(b)

The number of neutrinos per cubic meter.

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