How many eleventh magnitude stars are required to equal the brightness of one first magnitude?
A) 10
B) 100
C) 1000
D) 10,000

Name: How many eleventh magnitude stars are required to equal the brightness of one first magnitude? A) 10 B) 100 C) 1000 D) 10,000
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Quizplus · Accepted Answer

The magnitude scale is logarithmic, with a difference of 5 magnitudes corresponding to a brightness factor of 100. Therefore, a difference of 10 magnitudes (from 1st to 11th) corresponds to a brightness factor of 100^2 = 10,000.

How Many Eleventh Magnitude Stars Are Required to Equal the Brightness