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Practice Exam #3

20 Questions
Practice Exam #3
Questions and Answers
  • 1. 
    Which of the following is not a form of light?
    • A. 

      (a) radio waves.

    • B. 

      (b) microwaves.

    • C. 

      (c) x-rays.

    • D. 

      (d) All of the above are a form of light.

    • E. 

      (e) None of the above is a form of light.

  • 2. 
    Which of the following statements about the nucleus of a typical atom (such as the carbon in your little finger) is false:
    • A. 

      (a) The nucleus always has an overall positive charge.

    • B. 

      (b) The nucleus takes up a very small amount of space compared to the entire atom.

    • C. 

      (c) The nucleus can contain both protons and neutrons.

    • D. 

      (d) The nucleus is surrounded by positively charged electrons.

    • E. 

      (e) The nucleus contains most of the mass of the atom.

  • 3. 
    Which of the following has the shortest wavelength?
    • A. 

      (a) A photon of ultraviolet light.

    • B. 

      (b) Blue electromagnetic radiation.

    • C. 

      (c) An x-ray.

    • D. 

      (d) A radio wave.

    • E. 

      (e) Infrared radiation.

  • 4. 
    Which atom would be absorbing light with the greatest energy?
    • A. 

      A

    • B. 

      B

    • C. 

      C

    • D. 

      D

  • 5. 
    Which of the atomic transition(s) shown would be associated with emission spectra?
    • A. 

      (a) Transition A only.

    • B. 

      (b) Transition B only.

    • C. 

      (c) Transition A and C only.

    • D. 

      (d) Transition B and D only.

    • E. 

      (e) None of the above.

  • 6. 
    If you were an scientist at the National Science Foundation, which of the following telescope proposals would you fund?
    • A. 

      (a) An x-ray telescope at the North Pole.

    • B. 

      (b) A gamma-ray telescope in Puerto Rico.

    • C. 

      (c) A radio telescope on the floor of the Mojave Desert.

  • 7. 
    Energy is released from atoms in the form of light when electrons
    • A. 

      (a) move from high energy levels to low energy levels.

    • B. 

      (b) move in their orbit around the nucleus.

    • C. 

      (c) move from low energy levels to high energy levels.

    • D. 

      (d) are emitted by the atom.

    • E. 

      (e) are absorbed by atoms.

  • 8. 
    What happens to the light that is missing in an absorption spectrum?
    • A. 

      (a) It is absorbed by the atoms in the cool, low density gas and the gas gets hotter and hotter.

    • B. 

      (b) It is absorbed by atoms in the cool, low density cloud and then remitted in all different directions as an emission spectrum.

    • C. 

      (c) It is absorbed by atoms in the cool, low density cloud and then remitted in all different directions as a continuous spectrum.

    • D. 

      (d) It has disappeared from the universe.

  • 9. 
    If an electron in an atom moves from an energy level of 3eV to an energy level of 6eV,
    • A. 

      (a) a photon of energy 3eV is emitted.

    • B. 

      (b) a photon of energy 9eV is emitted.

    • C. 

      (c) a photon of energy 3eV is absorbed.

    • D. 

      (d) a photon of energy 9eV is absorbed.

  • 10. 
    What kind of spectrum is given off by a red colored, neon “OPEN” sign?
    • A. 

      (a) an emission spectrum with more bright emission lines at the red end of the spectrum

    • B. 

      (b) an absorption spectrum with more dark absorption lines in the blue part of the spectrum

    • C. 

      (c) a continuous spectrum that is brighter in the red than the blue

    • D. 

      (d) a spectral curve with a peak in the red part of the spectrum

  • 11. 
    11. Star A gives off the same amount of energy as Star B, but Star A is much much hotter than Star B. Which star has the greater surface area?
    • A. 

      (a) Star A

    • B. 

      (b) Star B

    • C. 

      (c) They have the same surface area

    • D. 

      (d) There is insufficient information to answer this question.

  • 12. 
    Which of the following layers of the Sun does nuclear fusion occur?
    • A. 

      (a) corona

    • B. 

      (b) core

    • C. 

      (c) photosphere

    • D. 

      (d) convection zone

    • E. 

      (e) none of the above

  • 13. 
    Use the energy output versus wavelength graphs shown below to answer the next question. By looking at the blackbody (or thermal) spectra of the four objects A–D, which, if any, of the other objects has the same temperature as object B?
    • A. 

      (a) Object A

    • B. 

      (b) Object C

    • C. 

      (c) Object D

    • D. 

      (d) They are all at the same temperature.

    • E. 

      (e) They are all at different temperatures.

  • 14. 
    What would happen if the fusion rate in the core of the Sun were increased but the core could not expand?
    • A. 

      (a) The Sun’s core would start to cool down and the rate of fusion would decrease.

    • B. 

      (b) The Sun’s core would reach a new equilibrium at a lower temperature.

    • C. 

      (c) The Sun’s core would reach a new equilibrium at a higher temperature.

    • D. 

      (d) The Sun’s core would start to heat up and the rate of fusion would increase even more.

  • 15. 
    The Hubble telescope is capable of making observation of stars, passing the light through a prism and making plots of their spectra. The graph below shows the brightness of the light at different wavelengths seen by the Hubble telescope when it looks at the Quasar PKS 0405-123. This Quasar is a dense, hot object in a distant galaxy. The light from the quasar passes through the intergalactic medium, a diffuse, cool gas. What type of spectrum is the Hubble telescope seeing when it looks at Quasar PKS 0405-123.
    • A. 

      (a) Thermal spectrum.

    • B. 

      (b) Absorption spectrum.

    • C. 

      (c) Emission spectrum.

    • D. 

      (d) None of the above.

  • 16. 
    Listed following are the different layers of the Sun. Rank these layers based on their distance from the Sun’s center, from greatest to least.
    • A. 

      (a) corona, chromosphere, photosphere, convection zone, radiation zone, core

    • B. 

      (b) photosphere, chromosphere, corona, convection zone, radiation zone, core

    • C. 

      (c) corona, chromosphere, photosphere, core, radiation zone, convection zone

    • D. 

      (d) core, radiation zone, convection zone, photosphere, chromosphere, corona

    • E. 

      (e) core, radiation zone, convection zone, corona, chromosphere, photosphere

  • 17. 
    A high energy photon is produced by a nuclear reaction at the center of the Sun. Which diagram best represents how that photon escapes from the Sun’s radiation zone?
    • A. 

      A

    • B. 

      B

    • C. 

      C

    • D. 

      D

  • 18. 
    Consider the graph below which shows the spectrum of light emitted from two regions of the Sun’s surface; a sunspot and a normal part of the photosphere. Which curve corresponds to the light from a sunspot?
    • A. 

      A

    • B. 

      B

  • 19. 
    For the next two questions, classify each statement as either (a) an observation of the Sun, or (b) an inference based on the current, accepted model for the Sun. The Sun generates energy by fusing hydrogen into helium.
    • A. 

      A

    • B. 

      B

  • 20. 
    For the next two questions, classify each statement as either (a) an observation of the Sun, or (b) an inference based on the current, accepted model for the Sun. he photosphere is made mostly of hydrogen and helium.
    • A. 

      A

    • B. 

      B