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5 Written questions

5 Matching questions

  1. Which of the following best describes the fundamental difference between two different chemical elements (such as oxygen and carbon)?

    A) They have different atomic mass numbers.
    B) They have different numbers of protons in their nucleus.
    C) hey have different numbers of electrons.
    D) They have different names.
  2. How are wavelength, frequency, and energy related for photons of light?

    A) Longer wavelength means lower frequency and lower energy.
    B) Longer wavelength means higher frequency and lower energy.
    C) Longer wavelength means higher frequency and higher energy.
    D) Longer wavelength means lower frequency and higher energy.
    E) There is no simple relationship because different photons travel at different speeds.
  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. Lines of a particular element appear at the same wavelength in both emission and absorption line spectra
  5. Consider an atom of oxygen in which the nucleus contains 8 protons and 8 neutrons. If it is doubly ionized, what is the charge of the oxygen ion and how many electrons remain in the ion?

    A) Charge = +2; number of remaining electrons = 8.
    B) Charge = -2; number of remaining electrons = 10.
    C) Charge = +2; number of remaining electrons = 6.
    D) Charge = +2; number of remaining electrons = 2.
  1. a True
  2. b A) Longer wavelength means lower frequency and lower energy.
  3. c B) They have different numbers of protons in their nucleus.
  4. d C) Charge = +2; number of remaining electrons = 6.
  5. e B) It absorbs red light and reflects green light.

5 Multiple choice questions

  1. D) a thermal emitter.
  2. C) a molecule containing two or more elements
  3. True
  4. C) ion
  5. True

5 True/False questions

  1. Dissociation is the process in which

    A) the bonds between atoms in a molecule are broken.
    B) a molecule goes from the solid phase to the gas phase.
    C) the bonds between electrons around an atomic nucleus are broken.
    D) an element changes into another form.
    E) an electron is shared between atomic nuclei.
    A) the bonds between atoms in a molecule are broken.

          

  2. Suppose you had molecular oxygen (O2) chilled enough so that it was in liquid form. Which of the following best describes the phase changes that would occur as you heated the liquid oxygen to high temperature?

    A) It would evaporate into a gas, then the molecules would dissociate into individual oxygen atoms, then the atoms would become increasingly ionized as you continued to raise the temperature.
    B) The liquid molecules would quickly dissociate into a liquid of individual oxygen atoms. These atoms would then evaporate into a gas, and then become ionized to make a plasma.
    C) It would sublimate into a gas, then the molecules would lose electrons until no electrons were left, then the molecules would dissociate into individual oxygen nuclei.
    D) The cold temperature would first cause the oxygen to solidify. The solid would then sublimate into a gas, which would then become a plasma as the molecules lost their electrons, until finally it consisted of bonded pairs of oxygen nuclei stripped bare of any electrons.
    A) It would evaporate into a gas, then the molecules would dissociate into individual oxygen atoms, then the atoms would become increasingly ionized as you continued to raise the temperature.

          

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

    A) A hot object emits more radiation per unit surface area than a cool object.
    B) A cold object produces more total infrared and radio emission per unit surface area than a hot object.
    C) A hot object produces more total infrared emission than a cooler object.
    D) All the light emitted by hot object has higher energy than the light emitted by a cooler object.
    E) X rays travel through space faster than radio waves.

          

  4. If one object has a large redshift and another object has a small redshift, what can we conclude about these two objects?

    A) The one with the large redshift is moving toward us faster than the one with the small redshift.
    B) The one with the large redshift is moving away from us, and the one with the small redshift is moving toward us.
    C) The one with the large redshift is moving away from us faster than the one with the small redshift.
    D) The one with the large redshift is hotter and therefore is putting out more radiation.
    C) The one with the large redshift is moving away from us faster than the one with the small redshift.

          

  5. Suppose you have a 100-watt light bulb that you leave turned on for one minute. How much energy does it use?

    A) 6,000 joules
    B) 6,000 watts
    C) 100 watts
    D) 100 joules
    A) 6,000 joules