The figure below shows the spectra of two stars on the same scale (Star A = red line; Star B = green line). The three strongest (deepest) absorption lines in each spectrum are due to the same element (they are marked with arrows in the Star A spectrum). How does the radial velocity of Star B compare to the radial velocity of Star A? (Choose the most correct answer; assume both spectra were taken from Earth.) Normalized flux 1.1 1 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 882 882.5 883 883.5 884 Star A Star B 884.5 885 Havelength (nm) Star B is moving away from the Earth faster than Star A. O Star A and Star B are both moving away from the Earth with the same radial velocity. O Star B is moving towards the Earth faster than Star A. O Star A and Star B are both moving towards the Earth with the same radial velocity.
The figure below shows the spectra of two stars on the same scale (Star A = red line; Star B = green line). The three strongest (deepest) absorption lines in each spectrum are due to the same element (they are marked with arrows in the Star A spectrum). How does the radial velocity of Star B compare to the radial velocity of Star A? (Choose the most correct answer; assume both spectra were taken from Earth.) Normalized flux 1.1 1 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 882 882.5 883 883.5 884 Star A Star B 884.5 885 Havelength (nm) Star B is moving away from the Earth faster than Star A. O Star A and Star B are both moving away from the Earth with the same radial velocity. O Star B is moving towards the Earth faster than Star A. O Star A and Star B are both moving towards the Earth with the same radial velocity.
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Transcribed Image Text:The figure below shows the spectra of two stars on the same scale (Star A = red line; Star B = green line). The three strongest (deepest) absorption lines in each spectrum are due to the same
element (they are marked with arrows in the Star A spectrum). How does the radial velocity of Star B compare to the radial velocity of Star A? (Choose the most correct answer; assume both spectra
were taken from Earth.)
Normalized flux
1.1
1
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
882
882.5
883
883.5
884
Star A
Star B
884.5
885
Wavelength (nm)
Star B is moving away from the Earth faster than Star A.
Star A and Star B are both moving away from the Earth with the same radial velocity.
Star B is moving towards the Earth faster than Star A.
Star A and Star B are both moving towards the Earth with the same radial velocity.
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