Cuesta College, San Luis Obispo, CA
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(A) Sample A.
(B) Sample B.
(C) (There is a tie.)
(D) (Cannot be determined, as they have different amounts of inert material.)
Correct answer: (C)
The solidification age of a sample (how long ago has it been since it was last molten) is determined by the ratio of decay products to its unstable isotopes. A larger ratio of decay products to unstable isotopes corresponds to a sample with a very old solidification age, but since both samples have the same ratio of decay products to unstable isotopes, they must have the same solidification age.
Section 30676
Exam code: quiz07Sq5h
(A) : 10 students
(B) : 13 students
(C) : 13 students
(D) : 2 students
"Success level": 39% (including partial credit for multiple-choice)
Discrimination index (Aubrecht & Aubrecht, 1983): 0.55
Compare to an older version of this question from Fall 2010.
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