Question

The speed of light in four different materials is shown below:

Material Speed of light in thousand miles per second
A 140
B 78
C 186
D 124


Which statement is correct?
Material B is the least dense.
Material C is the most dense.
Material A is denser than Material D.
Material D is denser than Material A. ((my answer))

Answer 1

The answer is D.

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Answer 2

I agree with your answer of D.

If the material is more dense, then the speed that light travels through it must get slower. In Choice D, this fact is shown.

The denser material (Material D - 124) has a slower speed than the other option (Material A - 140). This is only choice that follows this pattern.