A schematic spectrum of the planet Mars is shown below.

A schematic spectrum of the planet Mars is shown below. Keeping in mind that Mars reflects visible sunlight and emits infrared light, refer to the numbered features of the graph and answer the following questions. For each answer, fully explain your reasoning. In your two reply posts this week, find a student that disagrees with you on one of the questions and either try to convince them of your reasoning (if you still believe you are correct), or tell them what part of their reasoning convinced you that they are correct. (The correct answers will be posted after the assignment is due!)

1) Which of the six numbered features represents emission lines?

2) Which of the six numbered features represents absorption lines?

3) Which portion(s) of the spectrum represent(s) reflected sunlight?

a) 1 only

b) 2, 3, and 4

c) 3 and 6

d) the entire spectrum

4) What does the wavelength of the peak labeled 6 tell us about Mars?

a) its color

b) its chemical composition

c) its surface temperature

d) its orbital speed

5) What feature(s) of this spectrum indicate(s) that Mars appears red in color?

a) the wavelength of the peak labeled 3

b) the wavelength of the peak labeled 6

c) the fact that the intensity of region 4 is higher than that of region 2

d) the fact that the peak labeled 3 is higher than the peak labeled 6

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