20141101

Astronomy quiz question: F5 main-sequence star versus M5 giant

Astronomy 210 Quiz 5, fall semester 2014
Cuesta College, San Luis Obispo, CA

An F5 main-sequence star and an M5 giant could have the same:
(A) luminosity.
(B) size.
(C) temperature.
(D) (Two of the above choices.)
(E) (All of the above choices.)
(F) (None of the above choices.)

Correct answer (highlight to unhide): (F)

An H-R diagram is provided with this quiz.


These stars are plotted on an H-R diagram below. The F5 main-sequence star has a dimmer luminosity, smaller size, and hotter temperature than the M5 giant, so they could not have the same luminosity, size, nor temperature.


Section 70158
Exam code: quiz05sP1d
(A) : 12 students
(B) : 0 students
(C) : 3 students
(D) : 6 students
(E) : 2 students
(F) : 15 students

Success level: 41% (including partial credit for multiple-choice)
Discrimination index (Aubrecht & Aubrecht, 1983): 0.83

Section 70160
Exam code: quiz05m1DI
(A) : 4 students
(B) : 5 students
(C) : 5 students
(D) : 2 students
(E) : 1 student
(F) : 15 students

Success level: 48% (including partial credit for multiple-choice)
Discrimination index (Aubrecht & Aubrecht, 1983): 0.78

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