The cosmic microwave background radiation is due to

a. neutrinos left over from the Big Bang.
b. electromagnetic radiation left over from the Big Bang.
c. the cooling of the universe to the point that photons no longer ionized neutral hydrogen atoms.
d. remnants of the cosmological singularity.


c.
as the universe cooled below 3000 K, the photons no longer tended to interact with matter and could pass throughout the universe.

Physics & Space Science

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a. True b. False Indicate whether the statement is true or false

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The self-inductance of a solenoid increases under which of the following conditions?

a. Only the solenoid length is increased. b. Only the cross sectional area is decreased. c. Only the number of coils per unit length is decreased. d. Only the number of coils is increased.

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Which organisms are multicellular eukaryotes, with the majority being photosynthetic producers?

a. plants b. animals c. fungi d. bacteria e. archaea

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Stars are evenly distributed throughout the Universe.

a. true b. false

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