According to the Big Bang model, in the earlier state of the Universe gamma rays converted into ________.
A. hydrogen and helium
B. pairs of matter and antimatter
C. pairs of protons and neutrons
D. X-rays
Answer: B
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A. 0.0800 B. 0.645 C. 450 D. 12.5 E. 200
Recent measurements of the temperature fluctuations in the cosmic microwave background radiation support the prediction of inflation that the overall geometry of the universe is flat
Indicate whether the statement is true or false
If a force on an object is aimed in the direction of the object's velocity, the force does
a. no work c. negative work b. positive work d. any of the above
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a. roof b. walls c. floor d. windows