Question

through which of the following does light travel the fastest? vacuum (empty space) glass sapphire

Explanation:

Light travels fastest in a vacuum. In a vacuum, there are no particles to interact with light, so it can move unobstructed. In materials like glass or sapphire, light interacts with atoms and molecules, which slows it down. The speed of light in a vacuum is a fundamental constant in physics, approximately \(c = 3\times10^{8}\space m/s\).

Answer:

vacuum (empty space)