Final answer:
In one second, light will travel 299,792,458 meters, as the speed of light is 299,792,458 meters per second in a vacuum.
Step-by-step explanation:
The speed of light is commonly accepted to be 299,792,458 meters per second in a vacuum. When you're asked how many meters light will travel in 1.0 second, you can use this speed to calculate the distance. Light travels one meter in approximately 1/299,792,458 of a second; therefore, in one full second, light will cover 299,792,458 meters.