No, slower. Light travels fastest in a vacuum. Anything transparent that light can pass through slows it down somewhat. Diamond crystal slows it down notably, which is part of what causes the "fire" in a diamond.
No. The speed of light in transparent substances (other than the vacuum) is in general less than the speed of light in a vacuum.
No
light travels faster in vacuum.
Short answer: Yes. Long answer: Yes, it is possible for particles to travel through a medium (not a vacuum!) faster than light can travel through that medium (not a vacuum!), which gives rise to Cherenkov radiation. Tachyons - a type of superluminal particle that is theorized but has never been observed - should be able to travel faster than light, but they would not be able to travel at or below light speed.
No. Nothing can travel faster than light.
light in a vacuum
Gamma rays are a form of electromagnetic radiation, just as light is, and all EM waves propagate at the speed of light through a vacuum.
No, slower.
it travels faster through air.
No
No
Yes.
It travels fastest in a vacuum.
no
Light is an electromagnetic radiation that travel through air, vacuum, glass, plastics, ,,,
Light travels fastest through vacuum.
Light spectrum is part of the electromagnetic radiation spectrum. Electromagnetic waves travel better and faster (light speed in vacuum) in vacuum.
No.
Sound does not travel in a vacuum. It needs a medium in which to travel (unlike light) and so sound cannot travel in a vacuum. However, in a solid sound travels faster than in air.