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5 Written questions

4 Matching questions

  1. Suppose you watch a leaf bobbing up and down as ripples pass it by in a pond. You notice that it does two full up and down bobs each second. Which statement is true of the ripples on the pond?

    A) They have a frequency of 4 hertz.
    B) They have a frequency of 2 hertz.
    C) We can calculate the wavelength of the ripples from their frequency.
    D) They have a wavelength of two cycles per second.
    x
  2. Lines of a particular element appear at the same wavelength in both emission and absorption line spectra
  3. If we observe one edge of a planet to be redshifted and the opposite edge to be blueshifted, what can we conclude about the planet?

    A) We must actually be observing moons orbiting the planet in opposite directions, not the planet itself.
    B) The planet is rotating.
    C) The planet is in the process of falling apart.
    D) The planet is in the process of formation.
  4. If we say that a material is opaque to ultraviolet light, we mean that it ________.

    A) absorbs ultraviolet light
    B) emits ultraviolet light
    C) transmits ultraviolet light
    D) reflects ultraviolet light
  1. a A) absorbs ultraviolet light
  2. b True
  3. c A) Power is the rate at which energy is used, so its units are a unit of energy divided by a unit of time.
  4. d B) The planet is rotating.

5 Multiple choice questions

  1. Atomic weight is the number of protons plus neutrons in an atom.
  2. C) an emission line spectrum.
  3. True
  4. C) quantum mechanics.
  5. A) Star X is moving away from us faster than Star Y.

5 True/False questions

  1. 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.
    D) 81 times more energy.

          

  2. 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.
    B) It releases a photon equal in energy to its own energy drop.

          

  3. An atom of the element iron has an atomic number of 26 and an atomic weight of 56. If it is neutral, how many protons, neutrons, and electrons does it have?

    A) 26 protons, 30 neutrons, 26 electrons
    B) 26 protons, 30 neutrons, 30 electrons
    C) 26 protons, 56 neutrons, 26 electrons
    D) 13 protons, 43 neutrons, 13 electrons
    E) 13 protons, 56 neutrons, 13 electrons
    C) Charge = +2; number of remaining electrons = 6.

          

  4. The loss of an electron from a neutral helium atom results in

    A) neutral hydrogen.
    B) ionized hydrogen.
    C) ionized helium.
    D) neutral deuterium.
    E) ionized deuterium.
    C) ionized helium.

          

  5. 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.
    D) A hot object emits more total radiation per unit surface area than a cool object.