Exam 2 Practice Test 2

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

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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. The Sun and other stars produce spectra that would be classified as _________. A. continuous B. absorption C. emission D. blue shifted E. red shifted 2. The mass limit for a white dwarf star is 1.4 solar masses. Why? A. Above this mass the neutron pressure cannot balance gravity. B. Above this mass the electron pressure cannot balance gravity. C. Below this mass the star becomes a pulsar. D. Below this mass the star becomes a black hole. E. The star would become a supernova below this mass. 3. A blue visible photon has ___________________________ a red visible photon. A. the same energy and wavelength as B. a longer wavelength and more energy than C. a longer wavelength and less energy than D. a shorter wavelength and more energy than E. a shorter wavelength and less energy than 4. Ozone in the Earth’s stratosphere A. is the most abundant atmospheric greenhouse gas for our planet. B. breaks down infrared radiation. C. absorbs much of the incoming solar ultraviolet radiation. D. forms when ordinary oxygen mixes with freon. E. has been building up as a result of industrial combustion. 5. Sunspots are cooler than the surrounding photosphere because A. hot gas clouds in the upper atmosphere cast shadows onto the photosphere. B. magnetic fields inhibited the flow of energy rising to the photosphere from below. C. nuclear fusion has stopped in this part of the photosphere.
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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 2 - MULTIPLE CHOICE QUESTIONS (50...

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