Astronomy quiz question: light passing through a dark nebula

Astronomy 210 Quiz 6, spring semester 2015
Cuesta College, San Luis Obispo, CA

__________ light can be seen from stars behind a dark nebula.
(A) Blue.
(B) Infrared.
(C) Ultraviolet.
(D) Doppler shifted.

Correct answer (highlight to unhide): (B)

Dust particles will scatter shorter wavelength light more than longer wavelengths. Infrared light, which is the longest wavelength light listed here, should be least affected by passing through a dark nebula.

Section 30676
Exam code: quiz06n1iI
(A) : 10 students
(B) : 20 students
(C) : 6 students
(D) : 30students

"Success level": 59% (including partial credit for multiple-choice)
Discrimination index (Aubrecht & Aubrecht, 1983): 0.48