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Author Question: The cosmic microwave background radiation is due to a. neutrinos left over from the Big Bang. b. ... (Read 41 times)

bobbysung

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on: Jul 28, 2018
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.

Question 2

Which of the following is unique concerning the so-called Planck's time?
 
a. It is the time Planck took to solve the blackbody radiation problem.
  b. It is the time light takes to travel across a proton.
  c. It is about equal to the moment of creation of the universe.
  d. There is no such thing as Planck's time


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ndhahbi

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Reply #1 on: Jul 28, 2018
Answer to Question 1

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

Answer to Question 2

c.
Planck's time is on the order of 10-43 s, which is about when the Big Bang occurred.


bobbysung

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Reply 2 on: Jul 28, 2018
YES! Correct, THANKS for helping me on my review

jomama

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Reply 3 on: Yesterday
Excellent

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