Welcome to the Quiz!
This quiz contains 14 questions from a mix of 1 subtopics.
What happens to the frequency of sound waves when a car with its horn on moves away from an observer?
the frequency decreases
the frequency fluctuates randomly
the frequency remains the same
the frequency increases
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How are sound waves affected in front of a moving source?
the waves disappear
the waves are compressed
the waves remain unaffected
the waves are stretched out
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What happens to sound waves behind a moving source?
the waves are stretched out
the waves are compressed
the waves disappear
the waves remain unaffected
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What happens to the wavelength of light when a source is moving away from an observer?
the wavelength shortens, causing a blue shift
the wavelength fluctuates randomly
the wavelength remains unchanged
the wavelength elongates, causing a red shift
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What does a positive red shift (z) value indicate about a light source?
the source is approaching the observer
the source is receding from the observer
the source is stationary relative to the observer
the source is moving perpendicular to the observer
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What does a negative red shift (z) value indicate about a light source?
the source is approaching the observer
the source is stationary relative to the observer
the source is receding from the observer
the source is moving perpendicular to the observer
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How can the recessional velocity of a star be deduced from its spectrum?
by comparing the observed wavelength with the known wavelength for the same atom or molecule
by measuring the star's brightness
by analyzing the star's chemical composition
by determining the star's mass
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What causes the cosmological red shift observed in distant galaxies?
the contraction of the universe over time
the rotation of the galaxies
the expansion of the universe over time
the actual motion of the galaxies
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What term describes the shift in light towards shorter wavelengths, indicating an approaching source?
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Explain how the cosmological red shift differs from the red shift caused by the actual motion of galaxies.
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A galaxy is moving away from Earth with a red shift (z) of 0.1. Calculate the galaxy's velocity.
3 x 108 m s-1
2.997 x 108 m s-1
3 x 107 m s-1
1.5 x 107 m s-1
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What would be the observed red shift (z) for a star moving away from the observer at a velocity of 4.5 x 107 m s-1?
0.05
0.15
0.1
0.2
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If a galaxy's red shift is measured as 0.02, what is its recession velocity?
1 x 107 m s-1
6 x 107 m s-1
6 x 106 m s-1
1 x 108 m s-1
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The red shift observed in the absorption spectrum of a distant star is 0.04. Calculate the star's recession velocity.
1.2 x 108 m s-1
1.2 x 107 m s-1
6 x 107 m s-1
12 x 106 m s-1
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