How does the brightness of a fourth magnitude star compare with that of a ninth magnitude star?
A)It is 5 times brighter
B)It is 5 times fainter
C)It is 100 times brighter
D)It is 100 times fainter

Question

Quizplus · Accepted Answer

The magnitude scale is logarithmic, with a difference of 5 magnitudes corresponding to a brightness factor of 100. Therefore, a fourth magnitude star is 100 times brighter than a ninth magnitude star.

How Does the Brightness of a Fourth Magnitude Star Compare