Question

Out on the Bayou, you are doing some night fishing with your pals. You are using a slow trolling motor (you don’t want to scare the fish) and have a red light on the boat (so you can see but not ruin your night vision). You see a fish under the water, and observe that the red light is shining right on it.

1. (a) By what fraction does the speed of this light change as it moves through the water?

2. (b) Does the wavelength of the light change? If so, by how much?

3. (c) What is the energy of this light hitting the fish, given that the light is traveling through water?

4. (d) How far below the surface of the water would the fish need to be in order for the light to take 1 second longer to reach it - compared to if the light traveled through air?

Answer 1

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