Universe
11th Edition
ISBN: 9781319039448
Author: Robert Geller, Roger Freedman, William J. Kaufmann
Publisher: W. H. Freeman
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Question
Chapter 17, Problem 46Q
To determine
Which star, between a red star and a blue star, is farther away from the Earth, if it is given that both the stars have the same radius as both appear equally bright.
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Chapter 17 Solutions
Universe
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- What two factors determine how bright a star appears to be in the sky?arrow_forwardExplain how we can deduce the temperature of a star by determining its color.arrow_forwardStar A and Star B have different apparent brightnesses but identical luminosities. If Star A is 20 light-years away from Earth and Star B is 40 light-years away from Earth, which star appears brighter and by what factor?arrow_forward
- Explain what dispersion is and how astronomers use this phenomenon to study a star’s light.arrow_forwardOne method to measure the diameter of a star is to use an object like the Moon or a planet to block out its light and to measure the time it takes to cover up the object. Why is this method used more often with the Moon rather than the planets, even though there are more planets?arrow_forwardStereoscopic parallax is caused by taking photographs of same objects from same point of observation true or false?arrow_forward
- A star that is moving toward Earth will a. have its spectral lines shifted to the red. b. have its spectral lines shifted to the blue. c. appear hotter than it actually is. d. appear cooler than it actually is. e. appear dimmer than it actually is.arrow_forwardIf you observe a star’s blackbody spectrum twice, once from Earth and once from a space shuttle above Earth’s atmosphere, what will you see? An absorption spectrum from Earth and a continuous spectrum from space An absorption spectrum from space and a continuous spectrum from Earth An absorption spectrum from space and an absorption spectrum with more absorption lines from Earth An absorption spectrum from Earth and an absorption spectrum with more absorption lines from spacearrow_forwardTwo stars of the same diameter or observed to have surface temperatures of 4000 Kelvin and 16,000 Kelvin. Which star is probably the brighter of the two? How many times brighter?arrow_forward
- A star has an element in its atmosphere that normally emits a line of frequency fs = 7.5 x 10^14 vib/s. If astronomers measure the frequency of this line to be fo = 7.7 x 10^14 vib/s, then how fast are the Earth and this star traveling relative to each other? Remember that the correct equation for the speed v is given by v = [(fo^2 - fs^2) / (fo^2 + fs^2)] c Remember fo^2 means "fo squared."arrow_forwardTwo stars have the exact same luminosity, but star Y is four times dimmer looking that star X. This means that???? 1) star Y is four times as far away as star X 2) star Y is 16 times as far away as star X 3) star Y is half as far away as star X 4) star Y is twice as far away as star X 5) we can't figure out the relative distance of the two stars from the information givenarrow_forward
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