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5 Written questions

5 Matching questions

  1. What do we mean when we say that electron energy levels in atoms are quantized?
  2. When an atom loses an electron, it becomes

    A) sublimated.
    B) dissociated.
    C) ionized.
    D) an isotope.
    E) a plasma.
  3. Which of the following statements is true of green grass?

    A) It absorbs red light and emits green light.
    B) It absorbs red light and reflects green light.
    C) It transmits all colors of light except green.
    D) It means the lawn is healthy.
  4. 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.
  5. Which forms of light are lower in energy and frequency than the light that our eyes can see?

    A) infrared and radio
    B) ultraviolet and X rays
    C) visible light
    D) infrared and ultraviolet
  1. a The electrons can have only specific energies and not amounts of energy in between.
  2. b B) The star is moving away from us.
  3. c A) infrared and radio
  4. d C) ionized.
  5. e B) It absorbs red light and reflects green light.

5 Multiple choice questions

  1. C) a molecule containing two or more elements
  2. B) Its surface is cooler than the surface of the Sun.
  3. From the first rule of thermal radiation, we know that tripling the temperature of an object increases the amount of thermal radiation it emits per unit area by a factor of 34 = 81. Thus, increasing the surface temperature of the Sun from 6,000 K to 18,000 K would increase its thermal radiation by a factor of 81. The higher temperature of the Sun would shift the peak of its thermal radiation spectrum from its current place in the visible light region into the ultraviolet. The hotter Sun would emit more energy at all wavelengths, with the greatest output coming in the ultraviolet.
  4. D) The planet is rotating.
  5. B) a shorter average wavelength

5 True/False questions

  1. 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
    B) They have different numbers of protons in their nucleus.

          

  2. 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.
    C) molecules go from the solid phase to the gas phase.

          

  3. The greater the wavelength of light, the greater its energy.False

          

  4. 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
    B) radio, infrared, visible light, ultraviolet, X rays, gamma rays

          

  5. Which of the following statements about thermal radiation is always true?

    A) A hot object emits photons with a longer wavelength than a cool object.
    B) A hot object emits photons with a higher average energy than a cool object.
    C) A hot object emits more radio waves than a cool object.
    D) A hot object emits more X rays than a cool object.
    B) A hot object emits photons with a higher average energy than a cool object.

          

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