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
d
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What is the angular resolution of the eye at a wavelength of 500 nm for a pupil diameter of 2.8 mm?
A. 
B. 
C. 
D. 
E. 
Web designers measure relative font sizes as a percentage of an em unit.
Answer the following statement true (T) or false (F)
Arthur and Betty start walking toward each other when they are 100 m apart. Arthur has a speed of 3.0 m/s and Betty has a speed of 2.0 m/s. Their dog, Spot, starts from Arthur's side at the same time and runs back and forth between them
By the time Arthur and Betty meet, what is Spot's displacement?
In a Young's double-slit interference apparatus, by what factor is the distance between adjacent light and dark fringes changed when the separation between slits is tripled?
a. 1/9 b. 1/3 c. 1 d. 3 e. 9