Cuesta College, San Luis Obispo, CA
[Version 1]
The (simplified) absorption lines for Iota Sagittarii, a K0 giant, are shown at right. (The arrows indicate the expected wavelength values for a stationary K0 giant.) Based on its absorption line wavelength values, Iota Sagittarii must be a star:
(A) located a little farther away than 1 parsec.
(B) located closer than 1 parsec.
(C) moving towards Earth.
(D) moving away from Earth.
Correct answer: (D)
The absorption lines for Iota Sagittarii are shifted towards slightly larger values ("redshifted"), indicating that it is moving away from Earth.
Section 70158
(A) : 7 students
(B) : 4 students
(C) : 13 students
(D) : 20 students
(No response: 1 student)
"Success level": 47% (including partial credit for multiple-choice)
Discrimination index (Aubrecht & Aubrecht, 1983): 0.75
[Version 2]
The (simplified) absorption lines for Procyon A, a F5 main sequence star, are shown at right. (The arrows indicate the expected wavelength values for a stationary F5 star.)Based on its absorption line wavelength values, Procyon A must be a star:
(A) located a little farther away than 1 parsec.
(B) located closer than 1 parsec.
(C) moving towards Earth.
(D) moving away from Earth.
Correct answer: (C)
The absorption lines for Procyon A are shifted towards slightly smaller values ("blueshifted"), indicating that it is moving towards Earth.
Section 70160
(A) : 5 students
(B) : 3 students
(C) : 20 students
(D) : 14 students
"Success level": 52% (including partial credit for multiple-choice)
Discrimination index (Aubrecht & Aubrecht, 1983): 0.82
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