299,792,458 meters (186,242 miles) per second.
Light travels at a constant speed of 299,792,458 meters per second in a vacuum. However, as light travels through different mediums, it slows down depending on the medium. The crazy thing about light though, is that if it leaves a medium and starts travelling back through a vacuum, it once again goes 299,792,458 meters per second.
In a rough, round figure? 930,000 to 1. Sound travels roughly 1/5 of a mile per second in air. Light travels 186,000 miles per second in a vacuum. In five seconds sound travels one mile. In five seconds, light travels 930,000 miles in a vacuum.
In any substance, all electromagnetic waves travel at the same speed that light travels through that substance.
It's 1/0.8 = 1.25
That is the approximate speed of electromagnetic radiation (usually referred to as light) in a vacuum.
it travels at c (speed of light in a vacuum)
Light can travel faster through a vacuum than through air. In a vacuum, light travels at its maximum speed of about 299,792 kilometers per second. This is because there are no particles in a vacuum to slow down the light's speed.
The speed of light is dependent on the medium it travels through. Light travels fastest in a vacuum than in water or air.
nothing, as in no molecules present
The speed of light in a vacuum is constant. Otherwise, the speed of light will depend on what materials it travels through. For example, the speed of light in air is similar to the speed of light in a vacuum; in water, it is quite a bit slower.
In a vacuum, light always travels at the same speed, about 300 000 kilometers per second.
Light travels faster through a vacuum than through any other medium, such as air, water, or glass. In a vacuum, light can travel at its maximum speed of approximately 299,792 kilometers per second.
As the medium through which light propagates in space is closes to a vacuum, light propagates very well in space. However, it travels at the same speed as it would on earth, as light travels at 299,792,458m/s in a vacuum, regardless of where that vacuum is located. the light travels in same speed whether it travels in space or earth.
When light travels through anything that is not a vacuum, it will usually slow down.
If you mean "normal speed" to be the speed at which light travels in a vacuum, then no. Anything that differs from light moving through a vacuum slows the light down to a certain extent.
No, light travels slower in glass compared to a vacuum because the speed of light is affected by the medium through which it travels. In glass, light slows down due to interactions with the molecules in the material, leading to a reduction in its speed compared to a vacuum.
The speed of light varies because the absolute speed of light "C" is measured in a vacuum. When light travels through air, it goes slightly slower. When light travels through denser mediums still, such as glass, the speed decreases further still.