The cosmic background radiation is the A) result of the radioactive decay of hea
ID: 233228 • Letter: T
Question
The cosmic background radiation is the
A) result of the radioactive decay of heavier, unstable elements produced in supernova explosions.
B) faint glow along the elliptic, caused by sunlight scattering from dust particles.
C) electromagnetic remnants of the explosion in which the universe was born.
D) radio noise from hot gas in rich clusters of galaxies. _____
If the cosmic microwave background radiation is the radiation left over from the Big Bang, why is its temperature only 3 K?
A) The universe has expanded and cooled to the temperature we now observe for the background radiation.
B) The cosmic microwave background radiation we observe is not cool—it is very hot, just like the Big Bang.
C) The Big Bang was a cold explosion, not a hot explosion—its temperature was the same as the current temperature we observe from the cosmic background radiation.
D) The cosmic background radiation we observe now is not from the Big Bang at all—it is from cold, intergalactic hydrogen clouds that cover the sky.
Explanation / Answer
The cosmic background radiation is the
C) electromagnetic remnants of the explosion in which the universe was born.
Electromagnetic remnants are the proof for the explosion and subsequent formation of the universe.
_________________________________________________________________________________________
If the cosmic microwave background radiation is the radiation left over from the Big Bang, why is its temperature only 3 K?
A) The universe has expanded and cooled to the temperature we now observe for the background radiation.
The original Big bang was very hot,but as a result of the expansion , the temperature of the CMB reduced and is at present value of 3k.
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