SMT 314 - Introduction to Cosmology » Fall 2020 » HW 18

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Question #1
The cosmological constant, (lambda), was a concept introduced by Albert Einstein to support a static universe, one that is neither expanding nor contracting
A.   TRUE
B.   FALSE
Question #2
The curvature of three-dimensional space cannot be detected because we live within the three spatial dimentions.
A.   TRUE
B.   FALSE
Question #3
The proportionality between the red shift and lookback time of a distance galaxy (© 2020 Kelley Dawdy) is called Hubble's constant.
A.   FALSE
B.   TRUE
Question #4
A time far in the future of the Universe, when the density of photons and elementary particles (© 2020 Kelley Dawdy) will be very low and all the stars have burnt out, is known as the [a] (two words).
A.   dark era
B.   Hubble's constant
C.   lookback time
D.   dark energy
Question #5
The expansion of the Universe appears to be accelerating, driven by the repulsive effect of the cosmological constant or, more generally known as, [a] (two words).
A.   dark era
B.   magnetic field
C.   stellar mass
D.   dark energy
Question #6
The study of the origin & evolution of the universe is _______________.
A.   cosmology
B.   astronomy
C.   astrogeology
D.   heliology
Question #7
Two types of "stars" that have played central roles as standard candles are [a] variables and supernovae [b].
A.   Tauri, Ia
B.   Lyrae,II
C.   Cepheid, 1a
D.   Mira, II
Question #8
The theory that the Universe is isotropic and homogeneous is called the:
A.   complementarity principle
B.   uncertainty principle
C.   cosmological principle
D.   Hoyle's Law
Question #9
What shape do astrophysicists refer to our universe as:
A.   hyperbolic (saddle)
B.   flat
C.   spherical
D.   none of these
Question #10
Which one of the following statements about Hubble's constant, Ho, is false?
A.   Hubble's constant is believed to be constant throughout the Universe at a given time.
B.   Hubble's constant changes with time.
C.   If the expansion of the Universe has always been constant (neither speeding up nor slowing down), then the age of the Universe is 1/H0 .
D.   H0 is the constant of proportionality between the observed recession speeds (v) and distances (d) of galaxies.
E.   The value of Hubble's constant is best determined with the very nearest galaxies, whose distances can be measured accurately.
Question #11
Which one of the following statements about the big bang theory is false?
A.   The matter density of the Universe is decreasing with time.
B.   Everything used to be much closer together and hotter than the present time.
C.   The redshifts of distant galaxies are a consequence of the wavelength of light stretching during its journey to us.
D.   All, or almost all, clusters of galaxies move away from each other.
E.   There is a unique center within the Universe that coincides with where the big bang happened.

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