A vacuum, so no material
in a vacuum
Light travels at its "maximum velocity" in a vacuum. In any other medium, interference makes it appear to slow down. We're giving Čerenkov radiation the day off here.
All colors of light travel with the same speed.
The velocity of light is greatest when travelling through a vacuum. When travelling through something else, a glass material say, then its velocity is slower. The refractive index is the ratio of the speed of light in a vacuum to the speed of light in that substance. For example light travels in a vacuum about 1.3 times as fast as in water, so we say water has a refractive index of 1.3. And it is likely that the velocity in the glass will be different at different wavelengths of light.
No, velocity and color are independent. Color is determined by frequency, and speed is determined by what material the light is traveling through.
the greatest velocity a falling object reaches is terminal velocity
the greatest velocity a falling object reaches is terminal velocity
The velocity of light travelling through a material relates to the index of refraction of that material. In this group, air has the lowest index of refraction, follow by water, fused quartz, and crown glass. This means like travels the fastest through air, then water, then fused quarts, and finally glass.
Refractive Index: the ratio of the velocity of light in a vacuum to that in the given medium
The greatest velocity, achieved when the acceleration due to gravity is balanced by the aerodynamic deceleration, is called the terminal velocity.
No. The color is determined by the light's *frequency*, but, as Einstein proved, there is one and only one velocity at which light can propagate, c or the speed of light. All light propagates at this same velocity (there are ways to slow it down slightly, e.g. by passing through dense material, but this affects all light the same). The speed of light being a constant is one of the very foundations of modern physics.