ok so will someone explain me what they mean by speed of light because i don't get it.Do they mean that the speed of light is as an example when i turn the lights on in my house or something like that?srry for bad english
The speed of light is the speed at which light travels. The speed is 3.00 x 10 to the power of 8 meters per second. It is 300 million meters per second or 300 thousand kms per second which is really fast. It's so fast it can circle the euator of earth about 8 times in 1 second
Light is energy, which, some science believes, is made of the same basic building block as matter, or everyday objects. As such, it still has to travel. Light does not appear in the air, it comes from somewhere. And it travels at the speed of light, which is a little less than 300000000 meters/second, which is somewhere south of 190,000 miles per second. At this speed, the human brain cannot perceive the motion, so light appears to simply appear in place whenever you turn on a light in your house.
Light takes time to travel. It travels at 3 x 10^8 meters per second. When you turn a light on in your house, it takes time for the light to go from the light bulb to your eyes. If the bulb is 3 meters away, it takes 10 nanoseconds. That's a very small period of time, so you think it's instantaneous but it's not. Light from the moon takes a little over a second to reach us. Light from the sun takes about 500 seconds to reach us. Light from stars takes years to reach us.
Light is part of the electromagnetic spectrum, which are basically waves that travel through space. Other examples would be radiowaves or xrays. The speed of light is a measure of how fast these WAVES travel in a vacuum. i.e. how long it would take a wave to travel from one point to another if there were no other particles present.
Individual pieces of light are called photons, these little pieces travel at the speed of light. When you turn a light on in your house, it is emitting trillions upon trillions of these little photons, all traveling at or near the speed of light.
