A layer of ethyl alcohol (n = 1.361) is on top of water (n = 1.333). To the nearest degree, at what angle relative to the normal to the interface of the two liquids is light totally reflected?
a. 78°
b. 88°
c. 68°
d. 49°
e. the critical angle is undefined
a
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A force of 20 N is applied to a wire with an un-stretched length of 2.5 m. The wire gets 2.00 mm longer. The strain in the wire is
A. 
B. 
C. 
D. 
E. 
Which type of feature is the best evidence of lunar volcanism?
A) Rays around the latest eruptions B) Craters all over the Moon C) Vents seen erupting in the mountainous highlands D) Rilles associated with lava flows accompanying the mare formation E) The Orientale Basin
An ant and an elephant are walking through the jungle. On which does the greater buoyant force act?
A. The elephant B. The ant C. The same buoyant force acts on both D. Neither is floating, so no buoyant force is acting at all
The redshifts of Galaxy A and Galaxy B have been measured. The redshift of Galaxy B is twice that of Galaxy A. Which galaxy is farther away and by what factor?
A. There is not enough information to determine which is farther away. B. Galaxy A is twice the distance of Galaxy B. C. Galaxy B is four times more distant than Galaxy A. D. Galaxy B is twice the distance of Galaxy A.