Classification by luminosity (AQA A-Level Physics): Quizzes
📚Quizzes
Practise the questions
10 questions from this quiz
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Practise the questions
10 questions from this quiz
What is luminosity?
What is luminosity?
Power output of a star
What is the unit of luminosity?
What is the unit of luminosity?
What is intensity in astronomy?
What is intensity in astronomy?
Power received per unit area
What is the unit of intensity?
What is the unit of intensity?
If a star is twice as far away, by what factor does its intensity decrease?
If a star is twice as far away, by what factor does its intensity decrease?
4
On the apparent magnitude scale, what indicates a brighter star?
On the apparent magnitude scale, what indicates a brighter star?
Lower apparent magnitude
What apparent magnitude do the brightest stars have on the Hipparcos scale?
What apparent magnitude do the brightest stars have on the Hipparcos scale?
1
By what factor does brightness change for each 1 unit step in apparent magnitude?
By what factor does brightness change for each 1 unit step in apparent magnitude?
2.51
A difference of 5 magnitudes corresponds to what fold difference in intensity?
A difference of 5 magnitudes corresponds to what fold difference in intensity?
100
Star X has magnitude 3 and Star Y has magnitude 8. How many times brighter is Star X?
Star X has magnitude 3 and Star Y has magnitude 8. How many times brighter is Star X?
100