One of the absorption lines of hydrogen has a rest wavelength of 656 nm. Suppose you observe this line in four different stars, and find this line at the wavelengths show below. Which wavelength represents the star that is moving toward Earth the fastest?
A) 630 nm
B) 656 nm
C) 670 nm
D) 640 nm
A) 630 nm
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Graphical Addition: Refer to the figure, which shows four vectors 
,
, 
, and 
.
(a) Vector 
as
expressed in terms of vectors 
and 
is given byA) 
+ 
.B) 
- 
.C) 
- 
.(b) Vector 
as expressed in terms of vectors 
and 
is given byA) 
+ 
.B) 
- 
.C) 
- 
.
Fill in the blank(s) with the appropriate word(s).
A ball rolled along a horizontal surface maintains a constant speed because
A) its velocity remains constant. B) no horizontal force acts on it. C) of inertia.
Based on the observed amount of deuterium in the universe, we can conclude that
A) neutrons outnumber protons 7 to 1 in the universe. B) most of the deuterium that was created during the era of nucleosynthesis has since been destroyed. C) we live in a critical-density universe. D) the density of ordinary (baryonic) matter is about 5 percent of the critical density. E) ordinary (baryonic) matter makes 75 percent of the mass of the universe.
The theory that different forms of animals throughout Earth's past occurred in a definite order is called the principle of
A) fossil assemblage. B) faunal succession. C) conformable fossils. D) fossil determination.