Per13_exercise - Period 13 Exercise Answers E.1 Why did the...

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Period 13 Exercise Answers E.1 Why did the condensation of the gravitational force 10 –43 seconds after the Big Bang contribute to the cooling of the Universe? a) The gravitational force caused particles to expand rapidly in a process called the sudden expansion. b) The gravitational force caused light from stars to be redshifted. c) Energy going into the gravitational force reduced the energy of photons. d) The condensation of the gravitational force meant that stars no longer emitted radiation. e) None of the above answers is correct. E.1 = c
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E.2 The Sun is 1.6 x 10 –5 light years from the Earth. How many kilometers is the Sun from the Earth? (1 light year = 9.46 X 10 12 km) a) 1.7 x 10 6 km b) 9.5 x 10 7 km c) 1.5 x 10 8 km d) 1.5 x 10 11 km e) 5.9 x 10 17 km 1.6 x 10 –5 light yrs x 9.46 X 10 12 km = 1.5 x 10 8 km 1 light yr E.2 = c E.3 Light from a star is observed to be redshifted. What does this tell about the star? a)
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Per13_exercise - Period 13 Exercise Answers E.1 Why did the...

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