The speed of light in glycerol is

Question

The speed of light  in glycerol is

BlackTom AI · Accepted Answer

The question asks for the speed of light in glycerol, which is the light speed in a medium rather than in vacuum.
Option 1: 1.70 × 10^6 m/s. This is far too small for a liquid medium; typical speeds in liquids are on the order of 10^8 m/s, so this is not plausible.
Option 2: 3.00 × 10^8 m/s. This is exactly the vacuum speed of light; inside a medium like glycerol the speed is reduced, so this cannot be correct for glycerol.
Option 3: 4.41 × 10^8 m/s. Values greater than c are impossible for light in any medium, since light slows down when entering a medium, not speeds it up beyond vacuum.
Option 4: 2.04 × 10^8 m/s. This aligns with the relation v = c/n, where c ≈ 3.00 × 10^8 m/s and glycerol has a refractive index around n ≈ 1.47. Calculating gives v ≈ 3.00 × 10^8 / 1.47 ≈ 2.04 × 10^8 m/s, which is consistent with known optical properties of glycerol.
Thus, the correct choice corresponds to the slowed light velocity in glycerol, while the other options either reflect vacuum speed, an unphysical speed greater than c, or an unrealistically low value for a liquid medium.

The speed of light in glycerol is

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