Cuesta College, San Luis Obispo, CA
The Moon is in its waxing gibbous phase tonight. How many of the four phases shown above will the Moon pass through in the next two weeks? (Do not circle the phase pictures; clearly circle an (A)-(E) response below.) (A) (None of the above phases.)
(B) One.
(C) Two.
(D) Three.
(E) Four.
Section 30676
(A) : 8 students
(B) : 25 students
(C) : 19 students
(D) : 9 students
(E) : 3 students
Correct answer: (B)
Starting from waxing gibbous, the phases the Moon will go through in the two weeks would be full, waning gibbous, third quarter, and waning crescent (which is "halfway" around the Moon's orbit, approximately two weeks later). Thus out of the above choices (new, first quarter, waxing crescent, waning gibbous), the Moon would only go through one (waning gibbous).
"Difficulty level": 44% (including partial credit for multiple-choice)
Discrimination index (Aubrecht & Aubrecht, 1983): 0.42
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