Multiple Choice
What is the ratio of cosmic microwave background photons to hydrogen atoms, on average, in the universe?
A) about 1 billion to 1
B) about 1 million to 1
C) about 1 to 100-very few microwave photons
D) about 1 to 1-equal numbers of photons and hydrogen atoms
Correct Answer:
Verified
Correct Answer:
Verified
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