5
Homework #1
•
•Question 4:  (1 point)
•     If we have two stars in fictional constellations, and the two stars are named Alpha Buffalo and Beta Cowboy, which is brighter and by what factor? The apparent visual magnitude of Alpha Buffalo is 3.2 and the the apparent visual magnitude of Beta Cowboy is 2.7.
•
•  1. Alpha Buffalo is brighter by a factor of 1.6.   
•*2. Beta Cowboy is brighter by a factor of 1.6.   
•  3. Beta Cowboy is brighter by a factor of 1.3.   
•  4. Alpha Buffalo is brighter by a factor of 1.3.   
•  5. Beta Cowboy is brighter by a factor of 2.   
•  6. Alpha Buffalo is brighter by a factor of 2.   
•
•
•
•
•
•
•
•
•
•
•
•
•
mA – mB = 2.5 log(IB/IA), so IB/IA = 100.2 = 1.6