Survey
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
Reading Quiz 05 - Chapter 10 This is a preview of the published version of the quiz Started: Sep 26 at 10:14am Quiz Instructions Reading Quiz 05 - Chapter 10 of Understanding Our Universe Question 1 1 pts Match the word to its definition. parallax luminosity brightness apparent magnitude Question 2 [ Choose ] [ Choose ] [ Choose ] [ Choose ] 0.5 pts There are ___________ degrees in a circle. Question 3 There are _____________ arc minutes in 1 degree. 0.5 pts Question 4 0.5 pts There are _________ arc seconds in 1 arc minute. Question 5 0.5 pts There are _________ arc seconds in a circle. This chapter refers to a figure and two "Working It Out" exercises that are in Ch. 5: Working It Out 5.1. We have reproduced Fig. 5.4 here, and you may need to review the information given in Ch. 5. Question 6 Which law gives us the peak wavelength of a black body curve? Spectrum Law Kirchhoff's Law Wien's Law Stefan-Boltzmann Law 1 pts Question 7 1 pts When the temperature increases the peak wavelength decreases, meaning it is an ___?___ relationship. Negative Reverse Inverse Proportional Question 8 1 pts The complete relationship for determining the luminosity of the star is: L = 4πR2σT4 , with pi and sigma being constants. Is the luminosity of a star more dependent upon changes in its temperature or changes in its radius? Upon its temperature. Dependent upon temperature and radius equally. Upon its radius. Question 9 2 pts Match the term or phrase to its definition: ground state excited state emission line absorption line [ Choose ] [ Choose ] [ Choose ] [ Choose ] Question 10 1 pts It is impossible for a stellar object to have both an extremely high temperature and a very low luminosity. True False Question 11 1 pts It is possible for a star to have both a surface temperature lower than that of the Sun and a luminosity 100,000 times that of the Sun. True False Question 12 2 pts Match term or phrase to its definition: binary star eclipsing binary visual binary spectroscopic binary [ Choose ] [ Choose ] [ Choose ] [ Choose ] Question 13 1 pts A Hertzsprung-Russell (HR) Diagram tells us a lot about stars. One of the answers given below, however, is NOT something that can be inferred either directly or indirectly about the stars placed on an H-R diagram. Which answer is wrong? radius Exact location in the Milky Way suface temperature luminosity Question 14 1 pts "For stars of a similar composition, the mass of a main-sequence star alone determines all of its other characteristics." (p. 267) This means that if we use the absorption lines in the spectrum of a star and identify it as a main-sequence star, then we can get its luminosity. We can then measure its apparent brightness and get its distance. This method of determining distances is called spectroscopic parallax. True False Question 15 Good question for an exam: Along the main sequence (MS), temperatures of the stars range from about 40,000 K to 3,000 K, a little over a factor of 10. But, luminosities for MS stars range from 10E-4 to 10E+5, a factor of 1,000,000,000! What law explains this? 1 pts Wien's Law Stefan-Boltzmann Law Kepler's 3rd Law Newton's law of gravity Saving... Submit Quiz