Astronomy quiz question: B5 white dwarf vs. M0 red dwarf

Astronomy 210 Quiz 5, fall semester 2016
Cuesta College, San Luis Obispo, CA

A B5 white dwarf can have the same __________ as an M0 red dwarf.
(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): (A)

An H-R diagram is provided with this quiz.


These stars are plotted on an H-R diagram below. The B5 white dwarf has a higher temperature and a smaller size than the M0 red dwarf, but these two stars could have the same luminosity.


Section 70158
Exam code: quiz05s4nD
(A) : 16 students
(B) : 6 students
(C) : 3 students
(D) : 7 students
(E) : 1 student
(F) : 4 students

Success level: 46% (including partial credit for multiple-choice)
Discrimination index (Aubrecht & Aubrecht, 1983): 0.30

Section 70160
Exam code: quiz05n0Ko
(A) : 9 students
(B) : 6 students
(C) : 1 student
(D) : 8 students
(E) : 0 students
(F) : 1 student

Success level: 42% (including partial credit for multiple-choice)
Discrimination index (Aubrecht & Aubrecht, 1983): 0.09