Question

Consider the universe at a redshift of z = 2. What is the average matter density in the universe then compared to now? What is the average radiation energy density then compared to now? What is the temperature of the background radiation then? Suppose the energy density in matter, ρc 2 , is now 2000 times greater than the energy density in radiation. At what redshift did matter and radiation have equal energy densities?.

Name: consider the universe at a redshift of z 2 what is the average matter density in the universe then compared to now what is the average radiation energy density then compared to now what is t 63905
Uploaded: 2023-08-04T17:44:23-08:00
Duration: 2 min 47 s
Channel: Timothy James
Description: consider the universe at a redshift of z 2 what is the average matter density in the universe then compared to now what is the average radiation energy density then compared to now what is t 63905

          Consider the universe at a redshift of z = 2. What is the
average matter density in the universe then compared to now? What
is the average radiation energy density then compared to now? What
is the temperature of the background radiation then? Suppose the
energy density in matter, ρc 2 , is now 2000 times greater than the
energy density in radiation. At what redshift did matter and
radiation have equal energy densities?.

Added by Mar-A J.

University Physics with Modern Physics

Hugh D. Young 14th Edition

Instant Answer

Solved by Expert Timothy James

08/04/2023

Step 1

Redshift (z) is a measure of how much the wavelength of the light from distant objects in the universe has been stretched by the expansion of the universe. A redshift of z = 2 means that the universe has expanded so that wavelengths of light are stretched to twice Show more…

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Consider the universe at a redshift of z = 2. What is the average matter density in the universe then compared to now? What is the average radiation energy density then compared to now? What is the temperature of the background radiation then? Suppose the energy density in matter, ρc 2 , is now 2000 times greater than the energy density in radiation. At what redshift did matter and radiation have equal energy densities?.