Classification by luminosity (AQA A-Level Physics): Flashcards
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Luminosity
Luminosity
Rate of light energy released or power output of a star
Unit of luminosity
Unit of luminosity
Watts ()
Intensity
Intensity
Power received from a star per unit area on Earth
Unit of intensity
Unit of intensity
Law that intensity follows
Law that intensity follows
Inverse square law
Intensity of star twice as far away
Intensity of star twice as far away
One-fourth as much
Apparent magnitude ()
Apparent magnitude ()
Measure of how bright an object appears from Earth
Lower apparent magnitude indicates
Lower apparent magnitude indicates
Brighter star
1 unit change in apparent magnitude corresponds to
1 unit change in apparent magnitude corresponds to
Brightness change by factor of
5 magnitude difference corresponds to
5 magnitude difference corresponds to
100-fold difference in intensity