Answer:
2.19 x 10⁸ m/s
Step-by-step explanation:
The index of refraction n and the speed of light in ethanol v are related by the following equation

Where c is the speed of light in a vacuum. Replacing n = 1.37 and c = 3 x 10⁸ m/s, we get:

Therefore, the speed of light in ethanol is 2.19 x 10⁸ m/s