Question

score: 3/10 unit 1 origin of the universe quiz 1 in the diagram to the right, the spectral lines of hydrogen gas from three galaxies, a, b, and c are compared to the spectral lines of hydrogen gas observed in a laboratory. what is the best inference that can be made concerning the movement of galaxies a, b, and c? a galaxy a is moving away from earth, but galaxies b and c are moving towards earth. b galaxy b is moving away from earth, but galaxies a and c are moving towards earth. c galaxies a, b, and c are all moving towards earth. d galaxies a, b, and c are all moving away from earth. 2 the shortest wavelength in visible light is_____ a violet b red c blue d yellow 3 two pieces of evidence that support the theory that the universe is expanding are the a redshift of light from distant stars and the existence of nuclear fusion b redshift of light from distant stars and the existence of cosmic background radiation c blue shift of light from distant stars and the existence of nuclear fusion d blue shift of light from distant stars and the existence of cosmic background radiation 4 how does the concept of redshift help astronomers determine the movement of galaxies? use evidence from image 1 to support your answer. redshift helps determine the galaxies movement by looking at the shift of lines in the light from the galaxy

Explanation:

1. For question 1, the spectral lines of galaxies A, B and C are shifted towards the red - end compared to the laboratory hydrogen spectral lines, indicating redshift which means they are moving away from Earth.
2. In the visible light spectrum, violet has the shortest wavelength.
3. Redshift of light from distant stars shows that stars are moving away (evidence of expansion) and cosmic background radiation is a remnant of the early hot universe supporting the Big - Bang theory and expansion.
4. Redshift occurs when a galaxy is moving away from Earth. The spectral lines of the galaxies in image 1 are shifted towards the red end compared to the laboratory spectral lines, showing they are moving away.

Answer:

1. d. Galaxies A, B, and C are all moving away from Earth.
2. a. violet
3. b. redshift of light from distant stars and the existence of cosmic background radiation
4. Redshift occurs when a galaxy is moving away from Earth. The spectral lines of galaxies A, B and C in the image are shifted towards the red - end compared to the laboratory hydrogen spectral lines, indicating that these galaxies are moving away from Earth.