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Section 9.2
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1
What term is used to describe a change in frequency of a light source due to its motion relative to an observer?
A)Big Bang
B)Doppler effect
C)Hubble Law
D)Hubble constant
2
When a star is moving away from an observer, the spectral lines move…
A)between the yellow and green zones of the spectrum.
B)toward the green end of the spectrum.
C)toward the blue end of the spectrum.
D)toward the red end of the spectrum.
3
Which of the following is evidence that supports theories related to the expansion of the universe?
A)Doppler effect
B)speed-distance relationship of galaxy
C)blueshifting
D)gravitational expansion
4
What type of electromagnetic radiation left over from the Big Bang fills the universe?
A)microwaves
B)Gamma rays.
C)X rays
D)ultraviolet rays





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