Astronomy C10 : HW 2Introduction to AstronomyHomework 2 Problems from Pasachoffand Filippenko1. (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 wouldyou respond?3. (4 points) A spectral line from the left side of Saturn’s rings, as you see them, is at awavelength slightly shorter than the same spectral line measured fro the right side ofSaturn’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 temperaturein 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 abrighter orange, and finally very bright white. Discuss this sequence in terms of black-bodyradiation.
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