Astronomy 210 Quiz 3, spring semester 2016
Cuesta College, San Luis Obispo, CA
A total lunar eclipse will be visible for observers in San Luis Obispo, CA occur January 20, 2019[*]. During this total lunar eclipse, these observers would see:
(A) the moon, completely within Earth's shadow.
(B) the moon, completely illuminated by the sun.
(C) the moon completely blocking the sun.
(D) the sun, with part of it being blocked by the moon.
(E) the sun, with no part of it being blocked by the moon.
[*] timeanddate.com/eclipse/lunar/2019-january-21.
Correct answer (highlight to unhide): (A)
During a total lunar eclipse, the full moon will be completely within Earth's umbra, and would typically appear a very, very dark brown-red.
(If there is no lunar eclipse of any time, the full moon would be completely illuminated by the sun. During a partial lunar eclipse the full moon would have a dark shadow across part of it (assuming that is the extent of what is covered on the full moon), when only part of it (at most) would be within Earth's umbra.)
(The entire sun would be blocked by a new moon during a total solar eclipse, as seen by an observer located under the moon's umbra; only part of the sun would be blocked by a new moon (assuming that is the extent of what is covered by the moon) during a partial solar eclipse, where the observer is in the moon's penumbra.)
Section 70158
Exam code: quiz03zH0g
(A) : 25 students
(B) : 3 students
(C) : 2 students
(D) : 3 students
(E) : 3 students
Success level: 71% (including partial credit for multiple-choice)
Discrimination index (Aubrecht & Aubrecht, 1983): 0.40
Section 70160
Exam code: quiz03McC6
(A) : 10 students
(B) : 2 students
(C) : 4 students
(D) : 0 students
(E) : 0 students
Success level: 64% (including partial credit for multiple-choice)
Discrimination index (Aubrecht & Aubrecht, 1983): 0.60
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