Universe
11th Edition
ISBN: 9781319039448
Author: Robert Geller, Roger Freedman, William J. Kaufmann
Publisher: W. H. Freeman
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Chapter 5, Problem 3CLC
To determine
The speed and the direction of motion of the star if the wavelength of spectral line changes from
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We observe a star's spectral line at 510 nm which is normally at 500 nm. How fast is the star moving towards or away from us?
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Chapter 5 Solutions
Universe
Ch. 5 - Prob. 1CCCh. 5 - Prob. 2CCCh. 5 - Prob. 3CCCh. 5 - Prob. 4CCCh. 5 - Prob. 5CCCh. 5 - Prob. 6CCCh. 5 - Prob. 7CCCh. 5 - Prob. 8CCCh. 5 - Prob. 9CCCh. 5 - Prob. 10CC
Ch. 5 - Prob. 11CCCh. 5 - Prob. 12CCCh. 5 - Prob. 13CCCh. 5 - Prob. 14CCCh. 5 - Prob. 1CLCCh. 5 - Prob. 2CLCCh. 5 - Prob. 3CLCCh. 5 - Prob. 1QCh. 5 - Prob. 2QCh. 5 - Prob. 3QCh. 5 - Prob. 4QCh. 5 - Prob. 5QCh. 5 - Prob. 6QCh. 5 - Prob. 7QCh. 5 - Prob. 8QCh. 5 - Prob. 9QCh. 5 - Prob. 10QCh. 5 - Prob. 11QCh. 5 - Prob. 12QCh. 5 - Prob. 13QCh. 5 - Prob. 14QCh. 5 - Prob. 15QCh. 5 - Prob. 16QCh. 5 - Prob. 17QCh. 5 - Prob. 18QCh. 5 - Prob. 19QCh. 5 - Prob. 20QCh. 5 - Prob. 21QCh. 5 - Prob. 22QCh. 5 - Prob. 23QCh. 5 - Prob. 24QCh. 5 - Prob. 25QCh. 5 - Prob. 26QCh. 5 - Prob. 27QCh. 5 - Prob. 28QCh. 5 - Prob. 29QCh. 5 - Prob. 30QCh. 5 - Prob. 31QCh. 5 - Prob. 32QCh. 5 - Prob. 33QCh. 5 - Prob. 34QCh. 5 - Prob. 35QCh. 5 - Prob. 36QCh. 5 - Prob. 37QCh. 5 - Prob. 38QCh. 5 - Prob. 39QCh. 5 - Prob. 40QCh. 5 - Prob. 41QCh. 5 - Prob. 42QCh. 5 - Prob. 43QCh. 5 - Prob. 44QCh. 5 - Prob. 45QCh. 5 - Prob. 46QCh. 5 - Prob. 47QCh. 5 - Prob. 48QCh. 5 - Prob. 49QCh. 5 - Prob. 50QCh. 5 - Prob. 51Q
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- A star is often described as “moving” on an HR diagram; why is this description used and what is actually happening with the star?arrow_forwardWould a red star have a smaller or larger magnitude in a red filter than in a blue filter?arrow_forwardIf a star is moving towards us, what color will it appear?arrow_forward
- A star is observed to move away from us at a speed of 2.8km/s. How far is the star ? Express your answer in light years. I first tried 2.8 km/s divided by the Hobble constant of 21.4 km/s/MLY and got 0.13, but it's wrong.arrow_forwardIf a luminous object were moved to one-half the original distance, it would appear a. one-half as bright. b. just as bright. c. twice as bright. d. four times brighter. e. eight times brighter.arrow_forwardAt rest, hydrogen has a spectral line at 144 nm. If this line is observed at 168 nm for the star Proxima, how fast is Proxima moving in km/s? unansweredarrow_forward
- How far does light travel in 1 year? [This distance, known as a light-year (ly), is used in measuring astronomical distances (Ch. 18.1).]arrow_forwardWhich surface has a higher temperature — the surface of a yellow star or that of a red star?arrow_forwardExplain what dispersion is and how astronomers use this phenomenon to study a star’s light.arrow_forward
- Suppose you are given the task of measuring the colors of the brightest stars, listed in Appendix J, through three filters: the first transmits blue light, the second transmits yellow light, and the third transmits red light. If you observe the star Vega, it will appear equally bright through each of the three filters. Which stars will appear brighter through the blue filter than through the red filter? Which stars will appear brighter through the red filter? Which star is likely to have colors most nearly like those of Vega?arrow_forwardExplain how we can deduce the temperature of a star by determining its color.arrow_forwardAt rest hydrogen has a spectral line at 149nm. If this line is observed at 144nm for the star Proxima, how fast is Proxima moving in km/s?arrow_forward
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