Cosmic Perspective Fundamentals
Cosmic Perspective Fundamentals
3rd Edition
ISBN: 9780134988504
Author: Bennett, Jeffrey O., Donahue, M. (megan), SCHNEIDER, Nicholas, Voit, Mark
Publisher: Pearson,
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Chapter 12, Problem 5QQ

Choose the best answer to each of the following. Explain your reasoning.

If you observe two Cepheid variable stars to have the same period and one is brighter than the other. (a) the brighter one is closer. (b) the brighter one is farther away. (c) there is not enough information to determine which star is closer.

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a) Sketch a generic HR diagram, including labels for the axes. (Take a picture or scan your work and upload it as a separate file.) b) Consider the following three stars, place them on your HR diagram and determine their rough spectral type and class of star. Also calculate their size relative to the Sun. I) L = 0.001 Lsun T = 3000~K II) L = 20,000 Lsun T = 4000K III) L = 0.001 Lsun T = 15,000K
Use a sketch, an equation in addition to your precise and concise description. Please give a very detailed answer. 1) Discuss the process of spontaneous parametric down-conversion.
See the screenshot uploaded. Answer in a step-by-step format, add diagrams, and detailed side notes for a better understanding  Ps. Please answer on paper  Thank you!
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