hw3_f10_sol - Astronomy C10 / L&S C70U: Fall...

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Unformatted text preview: Astronomy C10 / L&S C70U: Fall 2010 Homework #3 Solutions Maximum points possible = 50 1. PF, p. 59, Q3 (4 points). Blurring by turbulence in Earths atmosphere limits a large ground-based telescopes ability to see detail at optical wavelengths. Closely spaced stars, for example, cannot be distinguished from each other. 2. PF, p. 59, Q8 (2 + 2 = 4 points total). (1) A telescope in orbit can observe wavelengths that cannot pass through the Earths atmosphere; these include gamma rays, X-rays, much of the ultraviolet region, and much of the infrared region. (2) Moreover, the clarity (resolution) of its images is not limited by atmospheric turbulence, which is actually the main limitation on ground- based resolution. (3) There is also less light pollution from Earth-based light sources in space, and one gets away from the infrared glow of the sky. Thus, despite the fact that the smaller telescope in space collects light more slowly than the larger ground-based telescope, the space telescope can perform some kinds of observations not possible from the ground. [Graders: Two of the above three answers suffices for full credit; 2 points per answer.] 3. PF, p. 59, Q10 (4 points). The primary mirror of the Hubble Space Telescope was imperfectly shaped, producing spherical aberration and resulting in blurry images. The problem was not definitively detected during construction and testing of the telescope. During a Hubble repair mission in 1993, additional mirrors were used to correct the problem, much like glasses and contact lenses correct human vision (but with lenses rather than mirrors). 4. PF, p. 59, Q14 (4 points). Remember that with telescopes, eyes, and other devices whose purpose is to gather light, Area is the key to their effectiveness; see Class Slides 45 and 46. The area of a circle is proportional to the square of its radius, and hence to the square of its diameter....
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This note was uploaded on 09/18/2010 for the course ASTRON 05989 taught by Professor Filippenko during the Fall '10 term at University of California, Berkeley.

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hw3_f10_sol - Astronomy C10 / L&S C70U: Fall...

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