What is the Cosmic Background Radiation?
Exit Check 8.7: The Big Bang

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Physics
•
9th Grade
•
Hard
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1.
FLASHCARD QUESTION
Front
Back
The Cosmic Background Radiation is the remaining energy from the Big Bang.
2.
FLASHCARD QUESTION
Front
What does it mean if a galaxy is redshifted?
Back
A redshifted galaxy is moving away from us.
3.
FLASHCARD QUESTION
Front
Which elements are most abundant in the visible universe?
Back
Hydrogen and Helium.
4.
FLASHCARD QUESTION
Front
What does the redshift of distant galaxies indicate about their movement?
Back
The further away galaxies are moving away faster, indicating that the universe is expanding.
5.
FLASHCARD QUESTION
Front
Why is the Cosmic Background Radiation referred to as the surface of last scattering?
Back
Photons in the early universe were scattered by electrons, making the universe opaque. When it cooled enough to form hydrogen, that last light traveled out as the CMB.
6.
FLASHCARD QUESTION
Front
What is the significance of the Cosmic Background Radiation in cosmology?
Back
It provides evidence for the Big Bang theory and the early state of the universe.
7.
FLASHCARD QUESTION
Front
How does redshift relate to the expansion of the universe?
Back
Redshift occurs because galaxies are moving away from us, which supports the theory that the universe is expanding.
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