Exam 2 Practice Test

Exam 2 Practice Test - MULTIPLE CHOICE QUESTIONS (50 pts.)...

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MULTIPLE CHOICE QUESTIONS (50 pts.) Choose the BEST answer to each of the following questions using what you have learned in ASTR 101. Indicate your choice on the scantron. (2 pts. each) 1. Certain regions viewed with optical telescopes appear black, like the Horsehead Nebula in Orion. Why? A. There are no stars here. B. Black holes limit our view. C. Dust in this region scatters visible photons out of our line of sight. D. The gas in the region absorbs all of the starlight. E. Some regions in space are completely empty. 2. The continuous spectrum (rainbow) that Mrs. Deming showed in class was produced by passing white light through a prism. The rainbow was produced as A. different colored atoms passed through the prism and were knocked out. B. components of white light (colors) were refracted by different amounts by the prism. C. the energy was diverted and converted into visible light. D. the prism converted ultraviolet photons to visible photons. E. the prism converted infrared photons to visible photons. 3. Uranus and Neptune appear blue-green through a telescope because A. methane in their atmospheres absorbs mainly red photons. B. methane in their atmospheres absorbs mainly blue and green photons. C. their surfaces are covered with water and their clouds are very thin. D. both of them have very small masses compared to the Earth. E. the wind speeds are very high and produce a blue shift. 4. The single most important factor influencing a star’s evolution is A. the strength of its magnetic field. B. its rotation rate. C. its surface temperature.
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This note was uploaded on 02/01/2011 for the course ASTR 101 taught by Professor Deming during the Spring '07 term at Maryland.

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Exam 2 Practice Test - MULTIPLE CHOICE QUESTIONS (50 pts.)...

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