If an object doubles its luminosity in 10 hours,how large can the emitting source of light be?
A)about 10 light-years across
B)about 10 parsecs across
C)about 10 light-hours across
D)varies depending on how luminous the object is
E)varies depending on how far away the object is

Question

Quizplus · Accepted Answer

If an object doubles its luminosity in 10 hours, it means that it emits twice the amount of light in 10 hours as it did in the previous 10 hours. This implies that the emitting source is changing rapidly, and thus cannot be larger than 10 light-hours across. Options A and B are too large to be plausible for a rapidly changing emitting source of light. Options D and E are not relevant to the given information.

If an Object Doubles Its Luminosity in 10 Hours,how Large