Star A has an apparent visual magnitude of 13.4, and star B has an apparent visual magnitude of 15.4.?

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Star A has an apparent visual magnitude of 13.4, and star B has an apparent visual magnitude of 15.4.?

Star A is ____ than star B.

a. 2 times fainter
b. 2 times brighter
c. 6.3 times fainter
d. 6.3 times brighter
e. 29.8 times fainter

2007-02-26 07:10:49 · 2 answers · asked by rui h 1 in Science & Mathematics ➔ Astronomy & Space

2 answers

gebobs has his math right but in the wrong direction. The lower the number the brighter the star appears. So the answer is D - star A is 6.3 times brighter than star B.

2007-02-26 08:32:28 · answer #1 · answered by Twizard113 5 · 0⤊ 0⤋

C. Use Pogson's ratio...

15.4 - 13.4 = 2.0
2.512^2.0 = 6.3

2007-02-26 07:17:33 · answer #2 · answered by gebobs 6 · 0⤊ 0⤋