This diagram represents what we call saddle-shaped geometry. In the context of this chapter, what is its significance?
A) It represents a two-dimensional analogy to one possible geometry for our universe.
B) It shows what our universe really looks like if the density is less than the critical density.
C) It shows the general shape of the cosmic microwave background.
D) Its dark color is meant to indicate that dark energy and dark matter are the primary constituents of the universe.
A) It represents a two-dimensional analogy to one possible geometry for our universe.
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Vision Problems: A person uses corrective glasses of power -8.5 D that are worn 2.0 cm from her eye.(a) Is she nearsighted or farsighted?(b) What is her far point without glasses?
What will be an ideal response?
Define the celestial sphere
What will be an ideal response?
Human activities that warm the Earth's atmosphere are caused by energy
A) production. B) consumption. C) both of these D) none of the above
A single slit of width a is illuminated by light of wavelength l. If a = 4.3l, the maximum number of dark fringes on a semi-circular screen surrounding the slit is
a. 2. b. 4. c. 6. d. 8. e. 9.