Astronomy 210 Quiz 6, Spring Semester 2010
Cuesta College, San Luis Obispo, CA
The monolithic collapse model is contradicted by which recent observation(s)?
(A) The sun has metal absorption lines.
(B) Not all globular clusters have the same age.
(C) Globular clusters with randomly tipped, elliptical orbits.
(D) The presence of dark matter in the halo.
Correct answer: (B)
According to the monolithic collapse model, material in the Milky Way had a spherical distribution, and the first generation of stars were born in globular clusters. These globular clusters were left behind in the halo of the Milky Way as matter collapsed into a thin disk. With no new material left in the halo, the only new star formation is in the disk of the Milky Way, which have higher metallicity, being made from the remnants of earlier massive stars.
Response (B) contradicts the monolithic collapse model, as it is expected that all globular cluster stars would only have formed before the collapse of material in the current disk of the Milky Way.
Response (A) is consistent with the monolithic collapse model, as is (C). Response (D) is a true statement that does not explicitly contradict the monolithic collapse model.
Section 30676
(A) : 4 students
(B) : 37 students
(C) : 18 students
(D) : 11 students
"Success level": 57% (including partial credit for multiple-choice)
Discrimination index (Aubrecht & Aubrecht, 1983): 0.62
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