Homework 2

# Homework 2 - Hint see p 33 of the textbook(c The same...

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HOMEWORK #2 Hardcopy due in class Friday, January 21 Please answer all questions in complete sentences, and in your own words. You may consult the textbook or another resource, but do not quote them. Explain how you arrived at your answer. If math is required, show your work in addition to your written explanation. You may consult with other students, but you must write up your own work in your own words. Copying another student's work is never OK (see syllabus). (1) Explain how to calculate the distance to a star. (2) What is the difference between Hydrogen (H), and Deuterium (D)? Why does D 2 O sink, when placed in H 2 0? (3) A scientist measures the wavelength of two electromagnetic waves; one has a value of 1.2 micrometers, and the other 500 nanometers. (Note that one nanometer = 10 -9 meter, one micrometer = 10 -6 meter) (a) How would the scientist classify these waves in the electromagnetic spectrum? (b) How much more (or less) energy do photons in the long-wavelength wave have than the short-wavelength wave?
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Unformatted text preview: Hint: see p. 33 of the textbook. (c) The same scientist has an image of two stars; one of the stars appears to be orange, and the other is blue. Which star has a higher surface temperature? (d) Let's say the scientist calculates the surface temperature of the stars to be 2000K and 15,000K, respectively. How much more power per square meter does the hot star emit than the cold star? (4) At the star party we used a telescope with a 6-inch aperture. The Mt. Wilson observatory uses a telescope with a 60-inch aperture. How much more light does the Mt. Wilson telescope collect than ours? (5) You have just discovered an asteroid with a small moon in its orbit. You are able to determine the average density of the asteroid to be 2 g/cc. Assuming the asteroid is partly rock (2.5 g/cc) and partly ice (1 g/cc), determine the fractional composition of the asteroid. Hint: let x equal the fraction of asteroid composed of rock and 1-x equal the fraction from ice....
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