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HW2 - Astronomy C10 HW 2 Introduction to Astronomy Homework...

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Astronomy C10 : HW 2 Introduction to Astronomy Homework 2 Problems from Pasacho ff and Filippenko 1. (11 points) See the course reader. 2. (4 points) If someone were to say that we cannot know the composition of distant stars, since there is no way to perform experiments on them in terrestrial laboratories, how would you respond? 3. (4 points) A spectral line from the left side of Saturn’s rings, as you see them, is at a wavelength slightly shorter than the same spectral line measured fro the right side of Saturn’s rings. Which way (direction) is Saturn rotating, and why? 4. (4 points) The Earth’s average temperature is about 27 C. What is its average temperature in kelvins? ( Requires a numerical answer ) 5. (4 points) An iron rod is heated by a welder’s torch. Initially it glows a dull red, then a brighter orange, and finally very bright white. Discuss this sequence in terms of black-body radiation.
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