Cuesta College, San Luis Obispo, CA
According to the density wave theory, a gas cloud forms new stars as it passes through a spiral arm because: (A) it slows down and compresses.
(B) it gathers more interstellar material.
(C) it will collide with dark matter.
(D) its metals will break down into non-metals.
Correct answer: (A)
According to the density wave theory, a gas cloud passing through a spiral arm does not collect new material to make new stars, but compresses as it encounters a "traffic jam" located there, which triggers new star formation.
Section 70158
(A) : 37 students
(B) : 4 students
(C) : 1 student
(D) : 0 students
Success level: 89% (including partial credit for multiple-choice)
Discrimination index (Aubrecht & Aubrecht, 1983): 0.50
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