midterm2S08

midterm2S08 - ASTRONOMY 100 Dr. Nick Warner 5:00 pm, March...

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1 ASTRONOMY 100 Dr. Nick Warner MIDTERM 2 ____________ 5:00 pm, March 11 th , 2008 SOLUTIONS AT END Exam Number Time Allowed: 1 hour _________________________ Name (Please Print) 1. Choose the list of planets which has the planets in the correct order of increasing distance from the Sun (not all the planets are listed). a) Earth, Venus, Jupiter, Uranus b) Jupiter, Saturn, Neptune, Uranus c) Saturn, Jupiter, Mars, Earth d) Venus, Mars, Saturn, Neptune e) Venus, Mercury, Mars, Earth 2. On the absolute scale of temperature (in Kelvin), the zero of the scale corresponds to a) the mean temperature of space b) the melting point of ice c) the freezing point of hydrogen d) the freezing point of nitrogen e) the temperature at which motions of atoms and molecules essentially cease 3. The Moon produces tidal disturbances on the oceans of Earth. In general, there is/are a) one high tide and one low tide per year. b) one high tide and one low tide per month. c) two high and two low tides per month. d) one high tide and one low tide per day. e) two high and two low tides per day. 4. Our Sun has a surface temperature of about 5,800 K and a dominant wavelength of emission at about 500 nm. What is the approximate dominant wavelength of emission for a star whose surface temperature is 11,600 K? a) 125 nm b) 250 nm c) 500 nm d) 1000 nm e) 2000 nm 5. Most of the mass of the solar system is made up of atoms or molecules of a) carbon, oxygen and nitrogen b) iron and silicon c) hydrogen and helium d) hydrogen and silicon e) helium and iron 6. A piece of iron is heated from room temperature 27 ° C = 300K to red hot at 627 ° C = 900K. By what factor will the total energy per second emitted by this iron increase? a) 3 b) 6 c) 9 d) 27 e) 81 7. An astronomer photographs the spectrum of an object and finds a spectral line at 499 nm wavelength. In the laboratory, this spectral line occurs at 500 nm. According to the Doppler effect, this object a) is moving toward the Earth at 1/500 the speed of light b) is moving toward the Earth at 499/500 the speed of light c) is moving away from the Earth at 1/500 the speed of light d) is moving away from the Earth at 499/500 the speed of light
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2 8. Figure 1 shows the crust of a planet and convection cells in the mantle underneath, where would you expect to see the most active uplift and mountain building? a) A b) B c) C d) D e) A and C 9. The early workers in spectroscopy (Fraunhofer with the solar spectrum, Bunsen and Kirchhoff with laboratory spectra) discovered what very significant fact about the spectra produced by hot gases, such as elements heated in a flame? a) The higher the temperature, the greater the proportion of red in the emitted spectral lines. b)
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This note was uploaded on 09/20/2009 for the course ASTR 50810 taught by Professor Rhodesjr during the Spring '08 term at USC.

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midterm2S08 - ASTRONOMY 100 Dr. Nick Warner 5:00 pm, March...

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