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5 Written questions

5 Matching questions

  1. Which of the following statements about X rays and radio waves is not true?

    A) X rays travel through space faster than radio waves.
    B) X rays have shorter wavelengths than radio waves.
    C) X rays and radio waves are both forms of light, or electromagnetic radiation.
    D) X rays have higher frequency than radio waves.
  2. Briefly explain how we can use spectral lines to determine an object's radial motion. Can we also learn the object's tangential motion (across our line of sight) from its spectral lines?
  3. Sublimation is the process in which ________.

    A) molecules go from the solid phase to the liquid phase
    B) molecules go from the liquid phase to the gas phase
    C) molecules go directly from the solid phase to the gas phase
    D) electrons are stripped from atoms
  4. When an electron in an atom goes from a higher energy state to a lower energy state, the atom

    A) emits a photon of a specific frequency.
    B) absorbs a photon of a specific frequency.
    C) absorbs several photons of a specific frequency.
    D) can emit a photon of any frequency.
    E) can absorb a photon of any frequency.
  5. Sublimation is the process in which

    A) molecules go from the solid phase to the liquid phase.
    B) molecules go from the liquid phase to the gas phase.
    C) molecules go from the solid phase to the gas phase. D) electrons are stripped from atoms.
    E) electrons are captured by ions.
  1. a A) X rays travel through space faster than radio waves.
  2. b C) molecules go directly from the solid phase to the gas phase
  3. c A) emits a photon of a specific frequency.
  4. d C) molecules go from the solid phase to the gas phase.
  5. e By comparing the wavelength of the spectral lines in the object's spectrum to the rest wavelengths of the same lines, we measure the Doppler shift. This tells us the object's radial motion: A shift toward shorter wavelength means the object is moving toward us, and a shift to longer wavelength means it is moving away from us. We cannot learn anything about the object's tangential motion from its spectral lines because this does not affect the line positions.

5 Multiple choice questions

  1. Different ionization states of the same element have different sets of spectral lines. Thus, we can identify the ionization state, which tells us about the temperature because higher temperatures are required to reach higher ionization states.
  2. C) Charge = +2; number of remaining electrons = 6.
  3. D) A positive charge and a negative charge will attract each other.
  4. D) several kilometers
  5. D) reflect visible light.

5 True/False questions

  1. Which of the following statements about X rays and radio waves is not true?

    A) X rays have shorter wavelengths than radio waves.
    B) X rays and radio waves are both forms of light, or electromagnetic radiation.
    C) X rays have higher frequency than radio waves.
    D) X rays have higher energy than radio waves.
    E) X rays travel through space faster than radio waves.
    A) X rays travel through space faster than radio waves.

          

  2. Define atomic weight (or atomic mass).the number of protons in an atom

          

  3. When white light passes through a cool cloud of gas, we see

    A) visible light.
    B) infrared light.
    C) thermal radiation.
    D) an absorption line spectrum.
    E) an emission line spectrum.
    D) reflect visible light.

          

  4. Suppose you know the frequency of a photon and the speed of light. What else can you determine about the photon?

    A) its temperature
    B) its acceleration
    C) its wavelength and energy
    D) the chemical composition of the object that emitted it
    C) its wavelength and energy

          

  5. Consider an atom of carbon in which the nucleus contains 6 protons and 7 neutrons. What is its atomic number and atomic mass number?

    A) atomic number = 6; atomic mass number = 13
    B) atomic number = 6; atomic mass number = 7
    C) atomic number = 13; atomic mass number = 6
    D) atomic number = 7; atomic mass number = 13
    A) atomic number = 6; atomic mass number = 13

          

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