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Assume the average density of the universe is 0.1 of the critical density needed for closure. What is the average number of protons per cubic meter, assuming the universe is composed mostly of hydrogen?

0.6$/ \mathrm{m}^{3}$

Physics 103

Chapter 34

Frontiers of Physics

Wave Optics

Particle Physics

University of Michigan - Ann Arbor

Simon Fraser University

Hope College

Lectures

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So the density just massive volume. Ah, and so you're given the massive A hydrogen atom. So the total mass would be number of hydrogen atoms times mass of one small him over volume. So really, you want to find number of volume? Ah, And so and it will be would be Rover em. Uh, density is four times 10 to the minus 28 kilograms per meter. Cubed last is massive. One Adam is 1.66 10 to the minus 27 kilograms. You can see you get an answer in terms off per meter. Cubed is what you wanted. And the answer is about 0.24 Hedican Adams, her cubic meter.

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