Astronomy 150 – Final Name:March 17, 2010 – Winter 2010 TA’s Name & Section:Answer all questions in the space provided. If you have any questions, raise your hand.100 points possible. NO CALCULATORS OR ANY ELECTRONIC DEVICES.The plot on th e left shows the reflectance spectra oftwo samples, Sample A (solid line), and Sample B (dot-ted line). Both are commonly found here in th e PacificNorthwest. Remember that you can see wavelengths ina range of 380 to 700 nm . Wavelengths longer than 750nm are in the infrared.1 (3 pts) What best describes the visible appearanceof sample A?(a) Bright Blue(b) Dark Blue(c) Bright Green(d) Dark Green(e) Bright Red(f) Dark Red2 (3 pts) What best describes the visible appearanceof sample B?(a) Bright Blue(b) Dark Blue(c) Bright Green(d) Dark Green(e) Bright Red(f) Dark Red3 (3 pts) At what wavelength would a filter be bestable to distinguish the two samples?(a) 450 nm(b) 650 nm(c) 850 nm(d) 1000 nm4 (3 pts) Which one of the sample is most likely tobe a pine tree?(a) Sample A(b) Sample B5 (3 pts) The other sample is most likely(a) Concrete(b) Basalt(c) Blue tarp(d) Wet soil6 (3 pts) In the infrared, these sample would appear(a) very bright(b) very dark(c) very red(d) very blue7 (8 pts) In the diagram below, show th e forces that are acting on each object (moon 1 and moon 2). Drawand arrow whose direction shows the direction of the force and whose length shows the amount of theforce. Ignore the effects of th e moons on the giant planet. (You s hould have 4 arrows)21Giant Planet8 (8 pts) Would you expect a world with a surface made of water ice to have a similar secondary atmosphereas a world with a surf ace made of rock? Why or Why not?9 (8 pts) Explain what it means for an asteroid to be in a 2:1 r esonance with Jupiter, and why there arenot many asteroids in this resonance.10 (8 pts) Describe how the composition and relative amounts of solid material available to buildplanets, differ inside the “snow-line” as compared to outside the “snow-line”.11 (8 pts) Explain why you would not find an asteroid made of 50% carbonaceous chond rite material and50% iron.12 (8 pts) Explain why, and in what way, a comet and an asteroid, both located at 1.2 AU from the Sun,would look very different.13 (8 pts) Ex plain why you can determine the mass of an unseen planet in orbit around a star, by justobserving the star.14 (8 pts) Explain why in 4 billion years, the Earth w ill no longer be geologically active, while the muchsmaller moon of Neptune, Triton will be.For each of the following objects, describe one way each h as directly affectedcomplex life (i.e. us) on Earth over the last 4.6 billion years.15 (6 pts) Earth’s magnetic field.16 (6 pts) Earth’s large Moon17 (6 pts)
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