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Home Q & A Board Science-Related Homework Help Physics
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marvelyoyo marvelyoyo
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11 years ago
What will the temperature of the cosmic microwave background be when the average distances between galaxies are exactly 7 times larger than they are today? Assume the current temperature of the CMB is 2.73 K.

I'm having trouble with this question, I can't seem to get it, I've tried everything and still can't get it.

I used 1+z = Tuniverse (at redshift z) /  2.73 K

I got various answers but they were all wrong, could use some help, thanks.
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#1
11 years ago
Found this online, might help Frowning Face

Distance ~ wavelength ~ 1/Temperature

=> 1/T = 1/To (1 + z)

T=2.73/8=.34 K

Makes more sense since we expect the temperature to be cooler when things get further.
marvelyoyo Author
wrote...
#2
11 years ago
It didn't work Confounded Face, thanks anyways I guess.
Answer accepted by topic starter
marvelyoyo Authormarvelyoyo
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#3
Posts: 9
Rep: 5 0
11 years ago
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