Cuesta College, San Luis Obispo, CA
Based on being able to detect its wavelength, and cost of location, which telescope should be funded?
(A) An x ray detector on a remote ocean platform (30' elevation).
(B) An far infrared telescope in the Mojave desert (5,000' elevation).
(C) A radio telescope on a high-altitude balloon (100,000' altitude).
(D) An ultraviolet detector in space (above 500,000' altitude).
Correct answer (highlight to unhide): (D)
X-rays and far-infrared cannot be detected at or not much above sea level (the bottom edge of the graph), due to absorption of these wavelengths by the atmosphere. A radio telescope would work on a high-altitude balloon, but would work just as well on the ground for much less cost. An ultraviolet telescope would work in space, and may work just as well on a high-altitude balloon as well. So while the radio telescope on a high-altitude ballon and the ultraviolet detector in space would both be able to detect their wavelengths, a vastly cheaper alternative for the radio telescope exists (putting it on the ground), compared to a slightly cheaper alternative for the ultraviolet detector, so the latter is most cost-effective than the former.
Section 30674
Exam code: quiz03nT7a
(A) : 1 student
(B) : 5 students
(C) : 1 student
(D) : 16 students
Success level: 72% (including partial credit for multiple-choice)
Discrimination index (Aubrecht & Aubrecht, 1983): 0.83
Section 30676
Exam code: quiz03sB1g
(A) : 4 students
(B) : 13 students
(C) : 6 students
(D) : 17 students
Success level: 46% (including partial credit for multiple-choice)
Discrimination index (Aubrecht & Aubrecht, 1983): 0.82
No comments:
Post a Comment