•-Star
A is 5th magnitude, Star B is 0th magnitude, how much brighter is B than A?
•IA/IB = (2.512) (mB-mA)
•IA/IB = (2.512) (0-5)
•IA/IB = (2.512)-5 = 1/100
•(IB/IA) = 100
•-One
star (A) is 1.5 magnitudes brighter than another star (B). What is the intensity ratio?
•IA/IB = (2.512) (mB-mA)
•IA/IB = (2.512) (1.5)
•IA/IB = 3.98
•-Finally,
one star is 50 times fainter than another star.
Does it have a larger or smaller magnitude? What is the magnitude difference?
•LARGER
•Δm = 2.5xlog (IB/IA =
50) = 4.2
•