problem_7

# problem_7 - ASTRONOMY 294Z The History of the Universe...

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ASTRONOMY 294Z The History of the Universe Professor Barbara Ryden Problem Set # 7: The Last Problem Set Due Tuesday, March 4 at class time NAME (please print clearly): SCORE (instructor use only): Reminder: The Final Exam for this class will be on Tuesday, March 11, at 1:30 pm. Be there!

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1) [20 points] The age of the universe (that is, the time since the Big Bang) is 14 billion years. The age of the Solar System is 4.56 billion years. Thus, the Solar System has existed for 32.6% of the age of the universe. For what percentage of the total age of the universe have the following things existed? a) helium nuclei b) neutral atoms c) the first galaxies to have formed d) the United States of America e) you
2) [20 points] The Whirlpool Galaxy is at a distance d = 7 . 1 Mpc from us. Using Hubble’s law, what do you expect the radial velocity v of the Whirlpool Galaxy to be? What do you expect the redshift z of the Whirlpool Galaxy to be? When hydrogen is at rest, it produces an emission line with a wavelength λ 0 = 656 . 281 nanometers; what wavelength λ would you measure for the corresponding emission line from hydrogen in the Whirlpool Galaxy?

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