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(4 exact duplicates found)

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5 Written Questions

5 Matching Questions

  1. 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?
  2. 1) If you have a 100-watt light bulb, how much energy does it use each minute?

    A) 6,000 joules
    B) 6,000 watts
    C) 600 joules
    D) 600 watts
    E) 100 joules
  3. The most common isotope of oxygen has atomic number 8 and atomic weight 16. Another isotope has two extra neutrons. What are the atomic number and atomic weight of this isotope?
  4. Consider an atom of gold in which the nucleus contains 79 protons and 118 neutrons. What is its atomic number and atomic weight?

    A) The atomic number is 79, and the atomic weight is 197.
    B) The atomic number is 79, and the atomic weight is 118.
    C) The atomic number is 118, and the atomic weight is 197.
    D) The atomic number is 118, and the atomic weight is 79.
  5. From lowest energy to highest energy, which of the following correctly orders the different categories of electromagnetic radiation?

    A) infrared, visible light, ultraviolet, X rays, gamma rays, radio
    B) radio, infrared, visible light, ultraviolet, X rays, gamma rays
    C) visible light, infrared, X rays, ultraviolet, gamma rays, radio
    D) gamma rays, X rays, visible light, ultraviolet, infrared, radio
    E) radio, X rays, visible light, ultraviolet, infrared, gamma rays
  1. a 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.
  2. b A) 6,000 joules
  3. c A) The atomic number is 79, and the atomic weight is 197.
  4. d B) radio, infrared, visible light, ultraviolet, X rays, gamma rays
  5. e The atomic number would still be 8 because the number of protons wouldn't change, but the atomic weight would increase to 18.

5 Multiple Choice Questions

  1. C) The one with the large redshift is moving away from us faster than the one with the small redshift.
  2. A) a diffraction grating
  3. B) They have different numbers of protons in their nucleus.
  4. False
  5. False

5 True/False Questions

  1. Each of the following describes an "Atom 1" and an "Atom 2." In which case are the two atoms different isotopes of the same element?

    A) Atom 1: nucleus with 6 protons and 8 neutrons, surrounded by 6 electrons;
    Atom 2: nucleus with 7 protons and 8 neutrons, surrounded by 7 electrons.
    B) Atom 1: nucleus with 7 protons and 8 neutrons, surrounded by 7 electrons;
    Atom 2: nucleus with 7 protons and 7 neutrons, surrounded by 7 electrons.
    C) Atom 1: nucleus with 8 protons and 8 neutrons, surrounded by 8 electrons;
    Atom 2: nucleus with 8 protons and 8 neutrons, surrounded by 7 electrons.
    D) Atom 1: nucleus with 4 protons and 5 neutrons, surrounded by 4 electrons;
    Atom 2: nucleus with 5 protons and 5 neutrons, surrounded by 4 electrons.
    neutrons, surrounded by 7 electrons.
    B) They have different numbers of protons in their nucleus.

          

  2. Which of the following statements about electrons is not true?

    A) Electrons orbit the nucleus rather like planets orbiting the Sun.
    B) Within an atom, an electron can have only particular energies.
    C) An electron has a negative electrical charge.
    D) Electrons have very little mass compared to protons or neutrons.
    E) Electrons can jump between energy levels in an atom only if they receive or give up an amount of energy equal to the difference in energy between the energy levels.
    D) A positive charge and a negative charge will attract each other.

          

  3. From shortest to longest wavelength, which of the following correctly orders the different categories of electromagnetic radiation?

    A) gamma rays, X rays, ultraviolet, visible light, infrared, radio
    B) infrared, visible light, ultraviolet, X rays, gamma rays, radio
    C) radio, infrared, visible light, ultraviolet, X rays, gamma rays
    D) gamma rays, X rays, visible light, ultraviolet, infrared, radio
    True

          

  4. Atomic nuclei consist of protons and electrons.1. Hotter objects emit more radiation per unit surface area.
    2. Hotter objects emit photons with higher average energy.

          

  5. You observe the same spectral line in two stars that are identical in every way except that one rotates faster than the other. How does the spectral line differ between the two?

    A) There is no difference.
    B) The line in the faster rotating star is blueshifted.
    C) The line in the faster rotating star is redshifted.
    D) The line in the faster rotating star is broader.
    E) The line in the faster rotating star is narrower.
    False

          

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