4 Multiple Choice Questions (Need Confirmation/No Explanation) Questions.
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- Air is made of 20% oxygen molecules and 80% nitrogen molecules. Oxygen is more massive than nitrogen. At any given temperature, how does the behavior of the two types of molecules compare?
(A) The average speed and average kinetic energy of the molecules is the same.
(B) The average speed of the oxygen molecules is higher, but the average kinetic energy is the same.
(C) The average speed of the nitrogen molecules is higher, but the average kinetic energy is the same.
(D) The average speed of the two types of molecules is the same, but the average kinetic energy of the oxygen is higher.
(E) The average speed of the two types of molecules is the same, but the average kinetic energy of the nitrogen is higher.
- The wave model can correctly provide all of these, but the Bohr model fails for one. Which of the following is evidence that the Bohr model is incorrect because it fails?
(A) An explanation for the observation that discrete emission spectra are produced by atoms.
(B) The ability to accurately predict electron energies for all atoms, not just hydrogen.
(C) An explanation for the observation that positively charged particles are repelled by the nucleus.
(D) An explanation for the observation that atoms can be broken into charged particles.
- When a single electron is sent through the slits, which of the following images best depicts the expected pattern?
(A) a single narrow band about as narrow as a single slit.
(B) a single broad band, i.e., broader than the combined width of the slits.
(C) a single dot.
(D) two narrow bands about the width of each slit.
(E) a series of bright and dark bands.
- Why was Rutherford’s “solar system” model of the atom inadequate to explain discrete emission spectra? (The Rutherford model had more than one shortcoming. The question asks about the problem specifically associated with discrete spectra.)
(A) Because electrons were considered particles.
(B) Because most of the atom was empty space.
(C) Because electrons were allowed to have any orbit and any amount of energy.
(D) Because electrons moved in circular orbits.
(E) Because the light would be absorbed by the atoms rather than be emitted.