Module 32 - The Expanding Universe Question Preview (ID: 58965)
The Expanding Universe.
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Astronomer Edwin Hubble observed that the wavelength of light emitted from galaxies was long and that it shifted toward the red end of the electromagnetic spectrum. Which conclusion about these galaxies can best be made from these observations?
a) The galaxies are old since their wavelengths of light are compressed.
b) The galaxies are newly formed since their wavelengths of light are stretched.
c) The galaxies are moving toward Earth because their wavelengths of light are compressed.
d) The galaxies are moving away from Earth because their wavelengths of light are stretched.
Which list correctly completes the model to represent how information from stars can be used to understand the nature of the universe?
a) 1. away 2. redshifted 3. expanding
b) 1. toward 2. unshifted 3. expanding
c) 1. toward 2. redshifted 3. contracting
d) 1. away 2. unshifted 3. contracting
This graph plots the measured velocity and distances from Earth of different galaxies. What does the graph show that supports the idea of an expanding universe?
a) The universe resulted from a giant explosion
b) The distance between galaxies decreases as the velocity of the galaxies increases
c) Galaxies accelerate away from Earth as the universe gets older.
d) More distant galaxies move away from Earth at a greater velocity than closer ones.
Which of the following would be the most valid argument for the Universe expanding?
a) Wavelengths of light reaching Earth as it expands would become increasingly longer.
b) Wavelengths of light reaching Earth as it expands would become increasingly shorter.
c) Wavelengths of light reaching Earth as it expands would remain the same in length.
d) Wavelengths of light reaching Earth as it expands would become increasingly blue-shifted.
Which of the following is the best argument that celestial objects in the Universe are moving away from Earth?
a) Wavelengths of light appear blueshifted as they move toward Earth
b) Wavelengths of light appear blueshifted as they move away from Earth
c) Wavelengths of light appear redshifted as they move away from Earth
d) Wavelengths of light appear redshifted as they move toward Earth
Students were analyzing the speed and distance of various galaxies from Earth. Which of the following supports the claim that the farther the galaxy the faster it is moving?
a) Galaxy A would be at location #4
b) Galaxy B would be at location #1
c) Galaxy C would be at location #1
d) Galaxy D would be at location #4
Students noticed the wavelengths of light from celestial objects was shifted toward the red wavelengths of light. Some students thought this was because celestial objects are moving away from Earth. Which is the best explanation of this argument?
a) Wavelengths decrease in frequency when objects move toward an observer.
b) Wavelengths decrease in frequency when objects move away from an observer.
c) Wavelengths remain the same in frequency when objects move toward or away from an observer.
d) Wavelengths increase in frequency when objects move away from an observer.
An astronomer was comparing two different stars and found that they are about the same size. She also found that the percentage of hydrogen in one star was much less than in the other. What can she best conclude from this observation?
a) The star with the most hydrogen was older.
b) The star with the most hydrogen has less mass.
c) The star with the most hydrogen was less bright.
d) The star with the most hydrogen was younger.
Which of the following best describes cosmic background radiation?
a) the theory that all matter and energy was compressed into a small volume Radiation and then exploded and began expanding.
b) a remnant of the Big Bang.
c) a force that opposes gravity and makes up 73% of the Universe.
d) material that does not give off light but has detectable gravity.
Which of the following is NOT evidence for the Big Bang theory?
a) Cosmic background radiation
b) Red shift in spectra of galaxies
c) Life cycle of stars
d) Age of comets and meteorites
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