20110923

Astronomy quiz question: phase during total lunar eclipse

Astronomy 210 Quiz 2, fall semester 2011
Cuesta College, San Luis Obispo, CA

An observer in San Luis Obispo, CA, is watching a total lunar eclipse. What phase is the moon in?
(A) New.
(B) First quarter.
(C) Full.
(D) Third quarter.
(E) (The phase depends on the time of day.)
(F) (None of the above choices, as moon is not in a phase during an eclipse.)

Correct answer: (C).

During a total lunar eclipse, the moon is completely within Earth's umbra (Earth being between the sun and the moon). Since the moon is on the night side of Earth, it must be in its full phase.

Section 70160
Exam code: quiz02n3rE
(A) : 7 students
(B) : 0 students
(C) : 20 students
(D) : 0 students
(E) : 0 students
(F) : 1 student

Success level: 74% (including partial credit for multiple-choice)
Discrimination index (Aubrecht & Aubrecht, 1983): 0.29

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