The speed of light changes when it goes from ethyl alcohol (n = 1.36) to carbon tetrachloride (n = 1.46). The ratio of the speed in carbon tetrachloride to the speed in ethyl alcohol, v2/v1, is
A. 1.99.
B. 1.07.
C. 0.932.
D. 0.511.
E. 0.760.
Answer: C
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