Astronomy quiz question: K5 giant vs. B5 white dwarf

Astronomy 210 Quiz 4, spring semester 2012
Cuesta College, San Luis Obispo, CA

A K5 giant will be __________ compared to a B5 white dwarf.
(A) cooler and dimmer.
(B) cooler and brighter.
(C) hotter and dimmer.
(D) hotter and brighter.

Correct answer: (B).

On the OBAFGKM spectral type sequence, K-type stars are cooler than B-type stars, while on an H-R diagram, giants are brighter than white dwarfs.

Section 30674
Exam code: quiz04noR3
(A) : 6 students
(B) : 24 students
(C) : 0 students
(D) : 2 students

Success level: 77% (including partial credit for multiple-choice)
Discrimination index (Aubrecht & Aubrecht, 1983): 0.50