Concept explainers
The star which has cooler surfaces.
Answer to Problem 1QAP
True.
Explanation of Solution
Stars behave like black body. Planck curve for black body
A cold star emits the red light at peak wavelength while hot star emits blue light at peak wavelength. The Sun has a surface temperature of 5800 K.
Greater the mass of star and temperature higher the luminosity of it, more the star appears blue and vice versa. H-R diagram gives the relationship between luminosity, surface temperature and radius of star. It shows the direct relationship between luminosity and radius of star.
Conclusion:
Red stars have cooler surfaces than blue stars. Thus the statement is true.
Want to see more full solutions like this?
Chapter 10 Solutions
UNDERST. OUR UNIVERSE(LL)-W/ACCESS+ACTI
- By what fraction are the wavelengths in this star's spectrum shifted?arrow_forwardSuppose you have discovered a new cepheid variable star. What steps would you take to determine its distance?arrow_forwardReview this spectral data for five stars. Which is the hottest? Coolest? Most luminous? Least luminous? In each case, give your reasoning.arrow_forward
- What are the largest- and smallest-known values of the mass, luminosity, surface temperature, and diameter of stars (roughly)?arrow_forwardAn astronomer is investigating a faint star that has recently been discovered in very sensitive surveys of the sky. The star has a magnitude of 16. How much less bright is it than Antares, a star with magnitude roughly equal to 1?arrow_forwardBased on their colors, which of the following stars is hottest? Which is coolest? Archenar (blue), Betelgeuse (red), Capella (yellow).arrow_forward
- A star has a temperature of 10,000 K and a luminosity of 102LSun . What kind of star is it?arrow_forwardTable 17.2 lists the temperature ranges that correspond to the different spectral types. What part of the star do these temperatures refer to? Why?arrow_forwardWhich main-sequence star would be the least luminous? a. A b. B c. F d. G e. Karrow_forward
- Stars and Galaxies (MindTap Course List)PhysicsISBN:9781337399944Author:Michael A. SeedsPublisher:Cengage LearningFoundations of Astronomy (MindTap Course List)PhysicsISBN:9781337399920Author:Michael A. Seeds, Dana BackmanPublisher:Cengage LearningAstronomyPhysicsISBN:9781938168284Author:Andrew Fraknoi; David Morrison; Sidney C. WolffPublisher:OpenStax