Cuesta College, San Luis Obispo, CA
The apparent magnitudes and absolute magnitudes of two stars are listed below.
| m apparent magnitude |
M absolute magnitude |
|
| Tureis | +2.8 | +1.4 |
| Beta Hydri | +2.8 | +3.5 |
If both Tureis and Beta Hydri are moved to 10 parsecs away from Earth, __________ will be appear to be brighter in the night sky, as seen from Earth.
(A) Tureis.
(B) Beta Hydri.
(C) (There is a tie.)
(D) (Not enough information is given.)
Correct answer (highlight to unhide): (A)
The absolute magnitude of a star is the brightness it has when placed 10 parsecs away from Earth. Since Tureis has an absolute magnitude of +1.4 that is brighter than Beta Hydri's absolute magnitude of +3.5, if both stars were placed 10 parsecs away from Earth, Tureis will appear to be brighter in the night sky.
Section 30674
Exam code: quiz05NoPw
(A) : 16 students
(B) : 2 students
(C) : 1 student
(D) : 0 students
(No responses: 1 student)
Success level: 86% (including partial credit for multiple-choice)
Discrimination index (Aubrecht & Aubrecht, 1983): 0.60
Section 30676
Exam code: quiz05So1L
(A) : 34 students
(B) : 7 students
(C) : 1 student
(D) : 0 students
Success level: 82% (including partial credit for multiple-choice)
Discrimination index (Aubrecht & Aubrecht, 1983): 0.64
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