answer 19-22 ObservedA Expected 2 Distance from center of galaxy-? 19. The plot
ID: 291011 • Letter: A
Question
answer 19-22
ObservedA Expected 2 Distance from center of galaxy-? 19. The plot above shows the a) orbital speed of disk stars b) orbital speed of halo stars as a function of distance from the center of a galaxy. -ešpin periods of stars Mspiral arm speed 20. The rotation velocity plot for a galaxy with most of its mass near the center would look like curve A. a) TRUE b)FALSE 21. The rotation velocity plot for a galaxy with a massive dark halo would look like curve A OTRUE b) FALSE 22. The rotation velocity plot for the Milky Way looks like curve B, a) TRUE b) FALSEExplanation / Answer
19. the ans is d-spiral arm speed as, y-axis is rotation velocity and x-axis is distance hece arm speed is a function of distance .
20. False , as for a galaxy with high mass at center would rotate much faster than the arm speed hence expected B curve might be the case .
21.True , as for the dark halos in the galaxy the mass is more or less uniform towards the outer side hence A type curve might be expected .
22.False , as thought of a galaxy the mass is concentrated in the center the curve B might have been the case, but in real all galaxies show A type curve as there are dark halos present uniformly throughout the galaxy
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