Web6 dec. 2014 · A photon will travel "at the speed of light" until obstructed. From the speed, and elapsed time, you can calculate how far the light will travel. Laser light consists of … Web18 sep. 2012 · Light travels about 300,000 kilometers (or 186,000 miles) in one second. That means it goes about 30 centimeters — about one foot — in one nanosecond. In one femtosecond, light travels just 300 nanometers — about the size of the biggest particle that can pass through a HEPA filter, and just slightly larger than the smallest bacteria.

How far can light travel? IOPSpark

Web1 Light Seconds to Meters = 299792458: 70 Light Seconds to Meters = 20985472060: 2 Light Seconds to Meters = 599584916: 80 Light Seconds to Meters = 23983396640: 3 Light Seconds to Meters = 899377374: 90 Light Seconds to Meters = 26981321220: 4 Light Seconds to Meters = 1199169832: 100 Light Seconds to Meters = 29979245800: … WebLight always travels at the speed of light when in a vacuum. Space is a pretty good vacuum. So if it's been travelling for 13.7 billion years, then it has travelled 13.7 billion light years. There is no contradiction here. Yes, those galaxies are now 46 billion light years light years away, but this is because the universe has expanded. high school of the dead streaming

How light travels - Light waves - KS3 Physics Revision - BBC

WebThe fact that we can see the Sun and stars shows that light can travel over enormous distances (150 million kilometres from the Sun). In fact there is no known limit to how far light can travel. However, as you will be aware from observing torch beams or car headlights, there is a limit to the distance over which these are effective sources of … Web1 sep. 2024 · Define the light year. A light year is a measure of distance equal to how far light travels in one Earth year. Because distances … WebWhat is light years away? A light year (ly) is the distance light can travel in one year. In one year, light travels approximately 5,880,000,000,000 miles or 9,460,000,000,000 kilometers. So this distance is 1 light year. For example, the closest star to us is about 4.3 light years away. how many cm hair grows in a month