Astronomy 210 Quiz 4, Fall Semester 2009
Cuesta College, San Luis Obispo, CA
[Version 1]
Achernar is a star located 36.2 parsecs away from Earth, and has an apparent magnitude of m = +0.51. If Achernar were relocated to 10 parsecs away from Earth, its apparent magnitude would:
(A) get brighter.
(B) remain the same.
(C) get dimmer.
(D) (Not enough information is given.)
Correct answer: (A)
The apparent magnitude would get brighter, as the star would be moving closer to Earth.
Section 70158
(A) : 32 students
(B) : 4 students
(C) : 7 students
(D) : 1 student
Success level: 74% (including partial credit for multiple-choice)
Discrimination index (Aubrecht & Aubrecht, 1983): 0.46
[Version 2]
Ross 154 is a star located 4.08 parsecs away from Earth, and has an apparent magnitude of m = +13.3. If Ross 154 were relocated to 10 parsecs away from Earth, its apparent magnitude would:
(A) get brighter.
(B) remain the same.
(C) get dimmer.
(D) (Not enough information is given.)
Correct answer: (C)
The apparent magnitude would get dimmer, as the star would be moving closer away from Earth.
Section 70160
(A) : 0 students
(B) : 0 students
(C) : 43 students
(D) : 0 students
Success level: 100% (including partial credit for multiple-choice)
Discrimination index (Aubrecht & Aubrecht, 1983): 0
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1 comment:
Now why was it harder for students to answer the question where the star was moved farther away, than where the star was moved closer?
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