Stars: Temperature and Brightness (Grade 9)
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Stars: Temperature and Brightness
Star A has an absolute magnitude of -4.9. Star B has an apparent magnitude of -6.2. Which star is the shortest distance from earth?
- Star A because it is brighter
- Star B because it is brighter
- Star A because it is bigger
- There is not enough information
The measure of a star's brightness is called its
- color index
- visual binary
Which of the following classes of stars would have the highest luminosity with a low temperature?
Which of the following stars would be hottest?
Apparent Magnitude is
- measure of the amount of light a star actually gives off
- a light year
- measure of the amount of a star's light received on Earth
- temporary features that come and go
If two stars have the same absolute magnitude, which of the following must be true?
- They are the same distance from Earth
- They have the same mass
- They are the same temperature
- None of the above
The H-R diagram plots the
- absolute magnitude vs. apparent magnitude
- mass vs. absolute magnitude
- luminosity vs. surface temperature
- surface temperature vs. mass
Which of the following stars is brightest?
- M= 3.9
- M= 5.2
- M= -1.7
- M= -2.3
If we compare two stars of different temperature, the hotter star emits more energy from each unit area of surface, so it
- will be larger
- will have a brighter absolute magnitude
- will appear redder
- will have a brighter apparent magnitude
Which color stars have the highest surface temperature?