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5 Written questions

5 Matching questions

  1. We can see each other in the classroom right now because we

    A) emit thermal radiation.
    B) emit visible light.
    C) emit infrared light.
    D) reflect visible light.
    E) reflect infrared light.
  2. Betelgeuse is the bright red star representing the left shoulder of the constellation Orion. All the following statements about Betelgeuse are true. Which one can you infer from its red color?

    A) It is much brighter than the Sun.
    B) Its surface is cooler than the surface of the Sun.
    C) It is much more massive than the Sun.
    D) It is moving away from us.
  3. The frequency of a wave is

    A) the number of peaks passing by any point each second.
    B) measured in cycles per second.
    C) measured in hertz (Hz).
    D) equal to the speed of the wave divided by the wavelength of the wave.
    E) all of the above
  4. Which of the following statements about thermal radiation is always true?

    A) A hot object emits more X rays than a cool object.
    B) A hot object emits more radio waves than a cool object.
    C) A hot object emits more total radiation than a cool object.
    D) A hot object emits more total radiation per unit surface area than a cool object.
    E) A hot object emits less total radiation than a cool object.
  5. From laboratory measurements, we know that a particular spectral line formed by hydrogen appears at a wavelength of 121.6 nanometers (nm). The spectrum of a particular star shows the same hydrogen line appearing at a wavelength of 121.8 nm. What can we conclude?

    A) The star is moving toward us.
    B) The star is moving away from us. C) The star is getting hotter.
    D) The star is getting colder.
    E) The "star" actually is a planet.
  1. a D) A hot object emits more total radiation per unit surface area than a cool object.
  2. b B) Its surface is cooler than the surface of the Sun.
  3. c E) all of the above
  4. d B) The star is moving away from us.
  5. e D) reflect visible light.

5 Multiple choice questions

  1. B) a shorter average wavelength
  2. The ice melts into liquid, then evaporates into gas. At higher temperatures, the water molecules dissociate atoms. At very high temperatures, the atoms are ionized.
  3. A) 6,000 joules
  4. A) emits a photon of a specific frequency.
  5. A) An electron begins in an excited state and then gains enough energy to jump to the ground state.

5 True/False questions

  1. Define atomic weight (or atomic mass).Atomic weight is the number of protons plus neutrons in an atom.

          

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

    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 8 protons and 8 neutrons, surrounded by 8 electrons
    Atom 2: nucleus with 8 protons and 8 neutrons, surrounded by 7 electrons
    C) Atom 1: nucleus with 92 protons and 143 neutrons, surrounded by 92 electrons
    Atom 2: nucleus with 92 protons and 146 neutrons, surrounded by 92 electrons
    D) Atom 1: nucleus with 1 proton and 0 neutrons, surrounded by 1 electron
    Atom 2: nucleus with 2 protons and 2 neutrons, surrounded by 2 electrons
    E) 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
    A) The temperature of the corona's gas is some 1 to 2 million Kelvin.

          

  3. There are more atoms in a glass of water than stars in the observable universe.True

          

  4. Electrons orbit an atomic nucleus like planets orbit the Sun.True

          

  5. Suppose the surface temperature of the Sun were about 18,000 K, rather than 6,000 K. How much more thermal radiation would the Sun emit? How would the thermal radiation spectrum of the Sun be different?A) Star X is moving away from us faster than Star Y.

          

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