Problem_6 - ASTRONOMY 294Z The History of the Universe Professor Barbara Ryden Problem Set 6 Due Tuesday February 26 at class time NAME(please

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ASTRONOMY 294Z The History of the Universe Professor Barbara Ryden Problem Set # 6 Due Tuesday, February 26 at class time NAME (please print clearly): SCORE (instructor use only): Only four questions on this problem set! However, the Fnal question is an essay question which counts double, so give it some careful thought.
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1) [20 points] Potassium-40 is an unstable atomic nucleus; it decays to argon- 40 with a half-life of 1.3 billion years. Suppose that a rock contains 1,000,000 potassium-40 atoms at the time it forms. How many potassium-40 atoms will be left after 1.3 billion years? How many will be left after 2.6 billion years? How many will be left after 3.9 billion years?
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2) [20 points] The “life span” of the Sun is 10 billion years; that is, at the time it formed, it contained enough hydrogen to power nuclear fusion for 10 billion years. The star Altair, like the Sun, is powered by the fusion of hydrogen to helium. The mass of Altair is M altair = 1 . 7 M sun . The luminosity of Altair is
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This note was uploaded on 07/17/2008 for the course ASTRO 294 taught by Professor Ryden during the Winter '08 term at Ohio State.

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Problem_6 - ASTRONOMY 294Z The History of the Universe Professor Barbara Ryden Problem Set 6 Due Tuesday February 26 at class time NAME(please

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