   Chapter 34, Problem 29PE

Chapter
Section
Textbook Problem

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?

To determine

The average number of proton per cubic meter.

Explanation

Given:

Critical mass density, ρ=1026kg/m3

Mass of proton, mp=1.67×1027kg

Formula:

Formula to calculate the average number of proton per cubic meter,

N=ρavgmp   ......... (I)

Where,

• N is the number of protons per cubic meter.
• ρavg is the average density of the universe.
• mp is mass of proton.

Calculation:

Since, the universe is mostly composed of hydrogen and the average density of the universe is 0.1 times the critical density.

ρavg=0.1×ρ=0.1×1026kg/m3

Substitute 0

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